After her mother's baffling suicide, prodigal daughter Heather Evans returns to her family home and discovers stacks of letters from serial killer Michael Reave. Known as the "Red Wolf," Reave has long been imprisoned for a series of ritualistic killings. When the body of a woman is found inside a tree—the corpse planted with flowers, just as the Red Wolf once did—Heather teams with DI Ben Parker to solve the case, but she must face the Wolf and learn truths she may not be ready to face.