Miriam Black has returned, along with her unpleasant precognitive power to see the time and manner of death of any person she touches. She's trying to settle into a normal life, but when she discovers a group of girls will be brutally murdered by a serial killer, she can't stay on the sidelines.
Mockingbird is Chuck Wendig's sequel to Blackbirds, which I previously reviewed. Blackbirds was about fate versus free will (warning, if you've not read Blackbirds yet, spoilers are ahead), and whether or not Miriam could change the horrible futures she saw for her few friends. When she attempts to intervene on behalf of Louis the trucker, who is perhaps her only friend in the world, she learns that she can change fate, but at a cost. For each life she saves, fate demands one in return.