A sniper shooting on an Alaskan motorway leaves a young man dead and a community running scared. As one family grieves, another becomes hell-bent on revenge as they formulate an audacious plot.

An armed stranger takes Deanna and her grandmother hostage two days before Christmas. As police in South Carolina piece together a brutal murder spree, they have no idea that the killer is close by holding a woman and her granddaughter hostage.

Nancy and her children are found dead in an apparent murder-suicide. Fifteen years later, Donna falls to her death in the Grand Canyon. Investigators discover that they are linked, and a serial killer has been lying in wait for decades.

A serial killer stalks Orange County, California, targeting the homeless, and a young man stands accused of murdering his family. Investigators must race to find the crucial link between the cases to catch a killer and free an innocent man.

When detectives identify a brutalised body in the desert, they never expect she's one of many. Three homicides are linked to convicted killer Phillip Jablonski, who records details of his killings in his grim audio diary.