Spring Girls by Karen Katchur

She's the only one who survived.and the only one who can help find the killer. Another spring, another dead girl pulled from a lake in the Appalachian foothills: the latest victim in a series of murders with few leads. But Detective Geena Brassard and her partner, Parker Reed, finally land a break when they receive a tip about a previously unknown survivor of the so-called Spring Strangler. The survivor's reluctant to help with the case for reasons that aren't all clear. Even so, Geena uncovers a connective thread between the victims, and recently discovered DNA brings her closer to the killer's identity. But Geena knows the survivor has the most to offer the investigation-if also the most to lose. Geena is torn between securing the surviving victim's help and protecting her from further danger. One thing is certain: Geena and Parker must find answers before the killer claims another life-or returns to finish off the one who got away.
Binding: Paperback / softback