Damaged detective Archie Sheridan is back home in Portland, Ore., trying to resume a normal life. Archie's ties to serial killer Gretchen Lowell still run deep, even if he's stopped their weekly visits in prison. Meanwhile, reporter Susan Ward is finishing an article accusing a beloved U.S. senator of seducing his children's 14-year-old babysitter a decade earlier. When three bodies are discovered in a local park where Archie's team found Gretchen's first victim 12 years earlier, Archie worries another serial killer is at large. After the senator's unexpected death, Susan discovers links between the sex scandal and the bodies in the park. When Gretchen escapes from prison, Archie knows he's the only one who can stop her from killing.