Charlie O’Reilly is an only child. Which is why it makes everyone uncomfortable when he talks about his brother, Liam. Up until a year ago, Liam slept in the bunk above Charlie, took pride in being as annoying as possible, and was the only person who could make Charlie laugh until it hurt.

Then came the morning when the bunk, and Liam, disappeared forever. No one even remembers him. The only person who believes Charlie is his best friend, Ana—even if she has no memory of Liam, she is as determined as Charlie is to figure out what happened to him.