In the fourth book of the Wall Street Journal bestselling series, FBI agent Mercy Kilpatrick must unlock the mystery of a mass murder, and the secrets of its silent witness…

For Mercy Kilpatrick, returning to rural Oregon has meant coming to terms with her roots. Raised as a prepper, Mercy is now relying on her survivalist instincts to defend her town from the people the law can’t reach. But this time, an investigation calling up a dark past for her and police chief Truman Daly may be hitting too close to home.

A rainstorm has uncovered the remains of five people—a reprise of the distinctive slaughter of two families twenty years ago. Except the convicted killer is in prison. Is this the case of a sick copycat, or is the wrong man behind bars? One person might have the answer. The lone survivor of the decades-old crimes has returned to town still claiming that she can’t remember a thing about the night she was left for dead. As the search for the truth becomes more dangerous, Mercy fears that the traumatized woman may not have buried her memories at all. She might be keeping them a secret. And there’s a price to be paid for revealing them.