The Lost Boy: A Dark Domestic Drama (The Child Trilogy Book 1) (Unabridged‪)‬

Your abducted child is miraculously returned. Too bad he's no longer normal. 

Stay-at-home mom Yvonne Landis enters her kitchen one day to meet a huge surprise: Seated on a chair is her son, Gabe. He went missing when he was ten years old, more than three years ago. It turns out he was abducted by pedophiles who made his existence a living hell. Extremely traumatized, he acts strangely and barely speaks. 

Yvonne is determined to heal Gabe. He'll stay at home and work daily with a trauma therapist. Her husband Ben is not completely on board with that idea, especially since Gabe stabbed him with a fork shortly after they were reunited. Then disturbing things happen to their younger son, 9-year-old Joseph, and Gabe may be behind those, too.... 

Note: Danger Child is the first suspense thriller in the Child trilogy.