"Night after night, Mackenzie's dreams return her to a memory from before her sister Sabrina's untimely death-- a weekend at the family's lakefront campsite, long obscured by a fog of guilt. But when the waking world starts closing in, too-- crows stalk her every move around the city; she gets threatening text messages from someone claiming to be Sabrina-- Mackenzie knows this is more than she can handle alone. Travelling north to her rural hometown...