There's a heat wave in Toronto and Duncan has a summer job in the Lost and Found of the subway in a room he calls the Dungeon. It's the most boring summer job in the world. Until he finds the little brown book. The book is a diary filled with the dark and dirty secrets of an anonymous serial killer. At first, the diary reveals the killer's earliest crimes--killing mice and cats, setting fires to abandoned buildings--but then the diary begins to reveal a darker craving--killing animals and setting fires just isn't enough. "This is kid's stuff," the diary says, "need something BIGGER." "Been hunting. Riding the subway. Searching the faces for the right one. All the pretty ladies sitting across from me. It's like an audition. A cattle call." Duncan keeps reading: "You looked right at me on the subway today, but you didn't see me. Nobody sees me. Until it's too late. You always sit in the front car in that little single seat near the driver. Do you feel safe there? Your hair is the color of rust. Is it your real color? Today your seat was taken by some snot with a skateboard. I wanted to snap his neck. But then you would have seen me, Cherry. And it's not time yet." Duncan can't stop reading, can't stop thinking. He's got to stop this man before he finds his next victim. He must anticipate the killer's next move. Duncan must stalk the stalker.