When Jillian Rivers opens her eyes, she's trapped in a mangled car. Then a stranger comes to her rescue . . .

But something about him sets Jillian on edge. And if she knew what is lying out there in the Montana woods, she'd be truly terrified.

Four people have already died, and detectives Selena Alvarez and Regan Pescoli are trying to make sense of a nightmare. With nothing but a killer's cryptic notes and their unsettling conviction that there is worse to come, someone is waiting . . . watching . . . poised to strike and make Jillian the next victim.