While the investigations go on in Dallas and Baton Rouge after the disappearance of a senator's daughter, FBI agents CJ Johnston and Paige Riley are assigned to the sleepy backwoods of East Texas for a dead-end assignment to infiltrate an all-girls school. Random disappearances dating back 50 years and more raise red flags that point to the tiny, isolated community of Hoganville. But CJ and Paige fear there will be little distraction from the memories of the one-night stand they shared six months ago.

Homicide detective Tori Hunter was used to doing things her way. But even after six different partners in seven years, she was not prepared for the hot-tempered Samantha Kennedy. Samantha, on the other hand, was trying to juggle a new job and a demanding boyfriend and now finds herself with an even greater challenge - being partnered with the most difficult detective in the entire squad.

Twenty-three years ago, a young girl went missing. Two days later her body was found lodged beneath the footbridge over Boulder Creek. The murder shook the town but they soon found it was only the beginning. A serial killer hides among them - a serial killer who strikes twice, sometimes three times a year. Mason Cooper couldn’t wait to leave Gillette Park. At 18, she headed off to college and the bright lights of Los Angeles, thinking she'd never return home to the broken family and forgotten friendships she'd left behind.

The isolated, sleepy little village of Timber Falls—built on the bend of a swift mountain river—swells during the summer months as tourists flock to town to run the river, lured there by the Class IV and Class V rapids. A gruesome murder of a college student—a river rat—brings the FBI to town. Lynn Carter, a disgraced LAPD detective, was offered an out—a position on a team of unorthodox FBI agents. When her commander sent her to Timber Falls—a town by only the stretch of the imagination—she had no idea she would find her peace there. No idea she might find love.

Two women vow to bring a killer to justice. Deputy Andrea Sullivan had hoped to leave the horrors of Los Angeles behind her, but the serial murders of college students in peaceful, picturesque Sedona are her nightmare case to solve. The complexities stretch local resources to the limit, and the FBI joins the case with Agent Cameron Ross in the lead.