The beautiful young woman is perfectly still, curled up in the trunk of the car, her long dark hair hiding her face. Her cotton blouse has ridden up a little, revealing two small dots an inch apart on her back. Just like the others. Guilt has kept FBI Agent Tori Hunter away from her home in Manchester Bay, Minnesota for 20 years, ever since her twin sister disappeared on the Fourth of July, when the girls should have been together. But when she receives an anonymous newspaper clipping about another missing girl, Genevieve, Tori is dragged back to the past.

Twenty years ago Ed Finch – America’s most notorious serial killer – used the Bay Area as his hunting ground. Now, his daughter Margot is a homicide detective with the San Francisco Police Department who has spent her whole life trying to forget who she is. But her daddy won’t let her forget. When Margot receives a phone call from his lawyer, she learns that Ed is back – transferred to death row at San Quentin. And her father has a message for her: he’s willing to disclose some long-held secrets. But there’s a catch. She has to visit him.

When Penny Matthews, a seven-year-old girl with blonde curls and a gap-toothed smile, goes missing in the Appalachian mountains, Detective Ellie Reeves is called straight to the scene. According to Penny’s parents, their daughter vanished after a picnic by the creek. All that’s left behind is a pink friendship bracelet etched with “Penny”.

When Detective Madison Harper arrives at a remote summer camp in Shadow Falls, Northern California, her heart breaks for Jenny, the sweet little girl last seen splashing in the lake with her friends before she vanished. Peering into the silent cabins filled with rows of neatly made beds, Madison knows this idyllic place is hiding a terrible secret.

Military veteran Amelia Storm returns to her hometown of Chicago when her beloved police officer brother is killed in the line of duty. Now she is a special agent with the FBI. No longer a scared girl, she vows to avenge her brother and do what she can to end the city's deep wells of corruption.