surveys the charred remains of the large suburban home, stopping to pause at the three lifeless bodies of the Woods family. Jenna knows she's looking for a serial killer, but her priority is finding the missing teenage daughter last seen on the night of the inferno. Days later, Sophie Woods's body is discovered floating in a shallow pool of crystal-clear water-known locally as Dead Man's Drop-but Jenna still doesn't know who would target the quiet family in such a brutal attack. Delving into the family's past, she makes a shocking discovery-a link between the killer and someone connected to her deputy . If Jenna is right and the killer is back and seeking revenge, then she must act fast to keep her deputy safe. When another girl is taken, Jenna and David follow the trail into a network of underground caves on the outskirts of town. With little time before the killer claims his next victim, they race into the pitch-black tunnels, unsure whether they have just walked into the killer's trap. Can they find the girl in time and escape the caves without the killer chasing them down?