“Go back to bed, Clara,” he said. “And leave Lily’s door unlocked tonight.”

He stepped out into the hallway.

I stood in the dark office, my hands shaking.

The house felt colder now, as if the walls themselves were holding their breath.

I did not go to sleep.

I went back to our bedroom and waited.

Nathan came in a few minutes later.

He climbed into bed without speaking.

He lay on his side, his back turned to me.

I lay on my side, my eyes wide open, staring at the digital clock on the nightstand.

The red numbers ticked by.

1:15 AM.

1:45 AM.

2:10 AM.

My phone lay on the mattress right next to my pillow.

I had set it to silent.

I had a secret of my own.

Two weeks ago, I had placed a small, battery-operated security camera inside a stuffed bear on Lily’s bookshelf.

I had told myself it was just to monitor her sleep walking.

Now, I knew it was for something else.

At 2:32 AM, the screen of my phone lit up with a silent notification.