The Bodies Left Behind by Jeffery Deaver

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 an aborted report of a crime? Off-duty deputy Brynn leaves her family's dinner table and drives up to deserted Lake Mondac to find out. She stumbles onto the scene of a heinous murder. . . . Before she can call for backup, though, she finds herself the next potential victim. Deprived of her phone, weapon and car, Brynn and an unlikely ally - a survivor of the carnage - can survive only by fleeing into the dense, deserted woods, on a desperate trek to safety and ultimately to the choice to fight back. The professional criminals, also strangers to this hostile setting, must forge a tense alliance too, in order to find and kill the two witnesses to the crime...