A spring night in a small town in Wisconsin A call to police emergency from a distant lake house is cut short A phone glitch or something more sinister? Off-duty deputy Brynn McKenzie leaves her family's dinner table and drives up to the deserted lake to find out And stumbles onto the scene of a murder Before she can call for backup, she finds herself the next potential victim Deprived of her phone, weapon and car, Brynn flees, along with the only survivor of the crime