The Keres Case — Julie C. Gilbert

After six years of silence, a serial kidnapper and killer returns …His plans are convoluted. His motives are obscure. He leaves notes, cards, and other clues. What he truly wants is a worthy opponent. He kidnaps a boy only to return him in the Erie National Wildlife Refuge as promised. Then, he snatches one of the volunteers searching the woods for the child.When FBI Special Agents Ann and Patrick Duncan are assigned to the case, they soon realize the kidnapper likes getting personal. To make matters worse, the perpetrator has help from surprising sources: victims' families. The more the agents learn about The Keres Legacy, the clearer it becomes that their family and friends are both fair game. Losing clearly means somebody dies, but even winning might come at a cost.