From #1 New York Times bestselling author Lisa Gardner, a chilling thriller about a young man gone missing in the wilderness of Wyoming…and the secrets uncovered by the desperate effort to find him Timothy O'Day knew the woods. Yet he disappeared on the first night of a bachelor party camping trip without a trace, breaking his parents' hearts, driving the other groomsmen mad with guilt, and leaving behind a pile of clues that won't add up. Frankie Elkin doesn't know the woods, but she does know how to find people. When Timothy's father organizes one last search, she heads to the mountains of Wyoming to join the rescue team, only to find that someone out there is willing to do anything to stop them. Soon, they're running out of time and up against the worst man and nature have to offer, discovering the evil that awaits those who go one step too far…