The register receipt machine at the CVS on Fourth Street always jammed when the humidity climbed, making this dry, sharp little clicking sound that used to drive me crazy before I learned just how to pop the plastic cover with my left thumb. I was standing in aisle four right then, holding a heavy cardboard carton of extra-strength ibuprofen with my thumb jammed against that plastic latch, when my apron pocket vibrated.

It was just a short, flat buzz against my hip. I didn’t think much of it. My sister usually texted around eleven to ask if I could pick up milk on my way home from the late shift, or sometimes the pharmacy manager, Brenda, sent a quick reminder about the morning inventory counts. I pulled the phone out while balancing the ibuprofen box against my waist, expecting to see something about dairy or stock.

Instead, it was the main office number for Oak Creek Elementary.

Brenda was walking past toward the breakroom with her clipboard tucked under her arm, and she gave me that look managers give when they see you checking a screen on the clock. I held up one finger, mouthing school, because Lily’s kindergarten teacher, Mrs. Gable, had my cell number saved for emergencies like fevers or playground skinned knees. I figured Lily had thrown up on her favorite purple leggings again or scraped her chin on the wood chips by the swings.

I swiped the screen and pressed the phone to my ear, expecting that soft, apologetic teacher voice they all use when they have to interrupt your shift.

“Hello, this is Brenda,” I said, thinking I was answering for the store for a second before I corrected myself. “I mean, this is Brenda’s register. This is Brenda’s mother. This is Cassie.”

“Cassie?” Mrs. Gable’s voice didn’t sound like it usually did during pickup. It was thin and tight, like she was trying to talk through a mouthful of gravel. “Cassie, are you somewhere you can talk privately for just a second?”

My thumb slipped off the ibuprofen carton and it hit the linoleum floor with a hollow plastic thud, scattering a few red pills across the white tiles near my sneakers. I didn’t even bend down to pick them up. I just stared at the little red circles rolling toward the base of the antacids display.

“Is it Lily?” I asked. My voice came out smaller than I wanted it to, raspy from breathing in that dry pharmacy dust all morning. “Did she fall down?”

“No, Cassie. She didn’t fall,” Mrs. Gable said, and I could hear the faint sound of a classroom door clicking shut on her end, muffling the distant, high-pitched squeal of kids playing with building blocks in the gym. “We were doing our morning circle time. We go around and talk about our weekends, you know how it is. Lily was holding that little wooden horse she always carries. She said something during sharing time that made me stop the circle.”

I felt this cold little prickle run right across the back of my neck, right where my hair was pinned up in a messy clip. “What did she say, Mrs. Gable?”

“She was talking about her room,” the teacher whispered, and I could hear her swallowing hard over the line. “Cassie, she told me, ‘My stepdad counts my bones at bedtime.’ She said it just like she was talking about eating breakfast.

She told me he turns off the lights and presses on her ribs. She said it hurts, but he tells her good girls don’t cry.”

The fluorescent lights overhead seemed to hum louder for a second, a high, vibrating drone that drowned out the hum of the store refrigerators. Four years of marriage to Mark. Four years of coming home from this exact CVS job at six in the evening, smelling like thermal receipt paper and cheap hand sanitizer, to find Mark standing by the stove stirring chili or checking his phone at the kitchen table. Four years of thinking we had finally built something quiet and safe after my first husband walked out to California and never sent a single dime back for diapers. Mark had been so good with her at first. He bought her that pink bicycle with the shiny silver streamers on the handlebars for her third birthday. He sat on the floor for hours helping her snap those little plastic Lego blocks together into crooked little towers.

“Cassie?” Mrs. Gable’s voice sounded like it was coming from the bottom of a well. “Are you still there?”

“I’m here,” I managed to say. My throat felt like it was lined with dry sand. “I’m right here.”

“I have her in the office with the principal now. You need to come, Cassie. Please.”

I didn’t ask Brenda for permission. I didn’t punch out at the terminal by the back exit or leave my apron on the hook in the locker room. I just stripped the blue polyester vest off my shoulders right there in aisle four, let it drop straight down onto the scattered red ibuprofen pills, and walked out through the automatic sliding glass doors into the parking lot. The midday sun hit my face like a hot iron. My 2008 Chevy Cobalt was parked three rows back, the blue paint peeling in little scabs along the hood where the salt from the winter roads had eaten through the clear coat. I jammed the key into the ignition, my hands shaking so hard the metal key scraped twice against the steering column before it found the slot.

Twelve minutes. That was how long it took me to make the drive from Fourth Street over to Oak Creek Elementary on the west side of town, driving forty-five in a thirty-five zone, gripping the top of the steering wheel until my knuckles turned the color of lard. My brain wasn’t working right. It was like someone had pulled the plug on the main breaker in the back of my skull and left only a dim, flickering emergency bulb burning. I kept seeing Mark’s hands. Big hands with square fingernails that he always kept trimmed short. Hands that smelled faintly of motor oil and peppermint chewables from his glove compartment.

When I pulled up to the curb by the school flagpole, I didn’t even park right in the visitor spaces. I just left the Cobalt half-straddling the yellow line, the engine still chugging with that little rhythmic knock in the lifters. I ran up the concrete steps so fast my left sneaker lace came undone, flapping against my ankle like a loose wire. The secretary inside the main office didn’t even try to stop me when she saw my face; she just pointed straight toward the little glass-walled conference room at the end of the short hallway.

Lily was sitting in a gray metal folding chair that was way too big for her. She was wearing her yellow duck t-shirt with the little green pocket on the front, and she had her arms wrapped tight around a scruffy brown teddy bear with one missing glass eye that belonged to the school counselor’s office. Her small legs didn’t reach the floor; they just dangled about six inches above the gray industrial carpet, kicking back and forth in a slow, aimless rhythm.

The school counselor, a woman named Mrs. Henderson with gray hair pulled back in a neat bun, stood up as soon as I pushed the door open. Her face looked gray, too, like she had just been told some terrible news about her own family.

“Cassie,” Mrs. Henderson said softly, reaching out to touch my elbow as I stumbled into the room. “Thank God you got here so fast.”

I dropped down onto my knees right there on the hard carpet. My knees hit the floor with a dull thud, but I didn’t feel it. I reached out and grabbed Lily by her little ankles, pulling her chair closer until her small knees were pressed against my chest. She didn’t look scared. That was the part that made my stomach heave up into my throat. She just looked tired, her little eyelids heavy like she hadn’t slept through the night in weeks, her dark hair falling across her forehead in sweaty little clumps.

“Mama,” Lily said, her voice small and flat. “Mr. Mark said we had to keep it a secret because it’s our special game.”

I couldn’t stand up. My legs had turned into wet paper. My whole body just caved in right there on the school carpet with my face pressed against Lily’s small knees, smelling her hair that smelled like cheap strawberry shampoo and old cotton.

The door creaked open behind me and a heavy pair of boots stepped into the room. It was Officer Vance, a local guy I’d known since we were both kids hanging out down by the grain elevator. He didn’t have his ticket book out or his hat on. He just knelt down beside me on the floor, his heavy leather duty belt clinking against the metal folding chair leg, and put one large, warm hand right between my shoulder blades.

“Cassie,” he said, his voice lower and gentler than I’d ever heard it sound in town. “Look at me for a second, hon.”

I raised my head up, my eyes burning like someone had thrown sand in them. Lily was still clutching that one-eyed teddy bear, staring down at my shoulder with those big, solemn eyes that looked so much like her real father’s before he took off.

“I called dispatch from my cruiser on the way in,” Officer Vance said, his eyes hard and steady as he looked from me to Lily. He reached out and touched Lily’s tiny shoulder very lightly, the way you’d touch a bird that might fly away if you breathed too hard. “He asked my daughter two questions,” I whispered, the words shaking so bad I could barely get them out. “Then he radioed for backup.”

Officer Vance nodded once, his jaw tight. “Ma’am, based on what your daughter described, your husband has been pressing her down against the mattress behind her bed frame to keep her completely silent while he worked on the air vent behind her wall.”

The counselor gasped, her hand flying up to cover her mouth, but I didn’t make a sound. The pieces didn’t even have to fall into place because I already knew. I remembered the heavy toolbox Mark kept stashed in the hall closet. I remembered the muffled rattling sounds from the back bedroom late at night when I thought he was just fixing the furnace ducts. Mark hadn’t been fixing anything. He had been using our five-year-old daughter’s body as dead weight to keep her pinned and terrified while he hid stolen retail cash and gambling money inside the bedroom wall.

“We have a warrant for the house,” Officer Vance said, standing up and pulling me gently to my feet by my elbow. “And we’re picking him up at the lumber yard right now.”

It took three days for the police to clear out the mess behind Lily’s bedroom wall, pulling out bundles of wrapped cash and stolen tools that Mark had been smuggling from his job at the hardware warehouse. They arrested him right there on the loading dock with his forklift idling, and he didn’t even try to run.

We moved into a small, two-room apartment on the north side of town three weeks later, away from the dust and the memories and the CVS receipts. The floors in the new place are old hardwood that creaks when you walk, but the bedroom windows look out right over a big maple tree that’s just starting to drop its leaves for the autumn.

Tonight, the room was quiet except for the hum of the small blue nightlight plugged into the wall by the closet. I sat on the edge of the twin mattress, pulling the yellow quilt up under Lily’s chin while she slept with her breathing slow and even, her face finally relaxed against the pillow. I lightly rested my hand right over her small chest, feeling the steady, unbroken rise and fall of her ribs beneath my palm as the streetlights flickered softly through the glass.