“She still thinks she’s doing this for my promotion.”

My husband laughed when he said it.

I was standing in the dark hallway outside our kitchen at two in the morning, in my socks, with one hand on the doorframe and the other on my stomach. I was twenty-four weeks pregnant.

The baby I was carrying wasn’t mine.

And it wasn’t Adam’s, either. Not on paper. On paper, it belonged to his boss.

A thin line of light glowed under the kitchen door. I’d woken up thirsty and found Adam’s side of the bed empty and cold. I’d come downstairs to get a glass of water.

I almost pushed the door open.

Then I heard him laugh.

“No,” he said quietly. “She doesn’t suspect anything. She’s actually been happier lately.”

The refrigerator hummed. The baby rolled over inside me, a slow, heavy turn, like someone shifting in their sleep.

His voice went soft. A voice I hadn’t heard him use with me in a very long time.

“I want that too,” he said. “I do. But we have to wait until the baby’s born. She has no idea about us.”

I held on to the doorframe.

“Graham,” my husband said. “Once she’s delivered, I’m leaving her. And we can finally raise our child together.”

I want to tell you that I knew something was wrong from the start.

I didn’t.

I want to tell you I was suspicious, or careful, or smart about it. That there were red flags and I saw every one.

I wasn’t. I didn’t.

I was a tired woman who loved her husband and wanted him back. That’s all. And the man I loved knew that about me better than anyone in the world.

So let me start where it started. With a birthday cake.

I was cutting Adam’s birthday cake when he brought up his boss.

It was a Tuesday in early March. Adam was turning thirty-eight. I’d made his favorite, a chocolate cake with peanut butter frosting, from the recipe his grandmother used to make. Our seven-year-old, Sophie, had helped me decorate it.

She’d used about four times as many sprinkles as a cake could reasonably hold. Rainbow ones. Chocolate ones. Little silver balls that crunch between your teeth. She’d written HAPPY BIRTHDAY DADDY in blue icing, except she ran out of room, so it said HAPPY BIRTHDAY DAD and then DY squeezed in sideways down the edge.

She’d been so proud. She sang to him twice. Then she went to bed, with blue icing still on her chin, after making him promise to save her a corner piece for breakfast…