Glass House, Late October

The alert came at 2:47 a.m. as a buzz against the ceramic dish on the nightstand, two short pulses followed by a third. I had been dreaming about holding a dog’s paw during surgery, the pad of it dry and cracked against my thumb. I reached for the phone and the screen lit the bedroom in a slab of white that made the ceiling look wet.

Person Detected — Hallway Camera.

The preview showed the upstairs hall from the high corner above Poppy’s door. The linen closet stood shut. The runner lay flat along the floorboards, its pattern of faded roses interrupted by nothing. No shadow moved at the edge of the frame. The timestamp read 02:47:09, and the clip ran nine seconds before the app cut it off.

I lay still and listened to the house. The baseboard heater in the bathroom clicked. Somewhere below, the refrigerator changed pitch, and the sound carried up the stairs like a voice heard through a wall. I counted Poppy’s breathing through the monitor I’d stopped using when she turned six but had plugged back in after the break-in, after the police report, after the glass on the back step that looked, to the responding officer, like it had been swept into a neat pile by someone who didn’t want to leave a mess.

The app showed no further alerts. I pressed the icon for live view. The hallway appeared in gray scale, the same empty runner, the same shut door. I watched the feed for one minute, then two. The phone grew warm in my hand. At 2:53 the camera’s status light blinked once, and I realized I had been holding my breath until the muscles in my shoulders ached.

I put the phone down and walked to Poppy’s room. The door was open the width of my hand, the way she left it because she didn’t like the click of the latch in the dark. She lay on her side with one arm thrown over the edge of the mattress, her fingers grazing the floor. The nightlight in the corner cast a low orange glow across her cheek. She smelled of shampoo and the strawberry lip balm she applied before bed with the seriousness of a surgeon.

I stood there until my feet went cold against the wood.

In the morning the hallway smelled like cigarette smoke. Not the stale residue of a coat or a handbag, but the raw, present smell of a cigarette that had been lit and exhaled in the last hour. I walked the length of the hall twice, sniffing. The odor was strongest outside the bathroom, where the wall met the doorframe at shoulder height. I pressed my nose to the wallpaper and breathed in.

Poppy came out of her room with her backpack dragging behind her, and I straightened up and smiled. She asked if we had any of the cereal with the marshmallows, and I said yes, and she said good, because yesterday there wasn’t any, and I said I bought more. She did not mention the smell. I did not mention the smell.

At breakfast I opened the app again. The 2:47 clip was gone from the timeline. In its place was a thumbnail labeled “Event — Motion,” timestamped 02:46:58, and when I tapped it the video showed the same empty hallway for four seconds. No alert had accompanied it. The app’s log listed the clip as “Processed” rather than “Saved,” which meant the system had decided it wasn’t important enough to keep.

I turned the phone face-down on the counter and poured Poppy’s cereal.

The cameras had gone in three weeks ago, a Tuesday, after the officer had finished taking photos of the back step and handed me a card with a number for victims’ services. I bought the system from the hardware store on Route 9, three white cameras with night vision and a hub that sat on the shelf beside the router, its blue light blinking in the dark like something breathing. The app was called Harbor, a name that made me think of boats and fog and the feeling of being tucked in. I installed the first camera above the back door, the second in the upstairs hall, the third in the kitchen angled toward the pantry.

The salesman had told me the system would learn the household’s patterns. It would know when Poppy came home from school, when I left for work, when the mail arrived. It would distinguish between a person and a shadow, between a face it knew and a face it didn’t. It would send alerts only when something mattered.

That was what he said.

The first week I checked the app every hour. The cameras showed the same rooms at the same angles, the