When paramedic Dia and detective Brig meet at the scene of a horrific accident on I-95 in steamy South Florida, neither is in the market for a relationship. 
Dia's fighting to save lives while still haunted by the violent, tragic death of her husband. Brig's looking for the killer who's setting bloody, violent accidents, and shaking off a bad divorce. But common danger pulls them together, even as a frightening stalker and ghostly warnings push them apart. 
Someone is watching her. Something is coming after her. And events from the worst night of her life hold a key she can't quite reach.