In the lonely woods around Grizzly Falls, Montana, the first body is discovered, stripped naked and tied to a tree. Alvarez and Pescoli have been hoping for a career-making case, but this is a nightmare. The killer stages car accidents on icy, isolated roads and "rescues" his victims. He toys with them, heals them, earns their trust . . . before subjecting them to a slow, agonizing death.

When Jillian Rivers opens her eyes, she's trapped in a mangled car. Then a stranger, claiming to be a trail guide, pries her free. Though she's grateful, something about him sets Jillian on edge. And if she knew what was lying in wait for her, she'd be truly terrified . . .

Even with the FBI involved, Selena and Regan have nothing to go on but a series of cryptic notes, and the unsettling knowledge that there is much worse to come. Piece by piece, the killer's brutal plan is taking shape. But his final move will be the most shocking-and personal-of all . . .