Lost Boys by Faye Kellerman

Faye Kellerman returns with an atmospheric, face-paced mystery set in bucolic upstate New York, full of unexpected twists and turns that build to a shocking and surprising end-the latest thrilling entry in her New York Times bestseller Decker/Lazarus series.
When Bertram Telemann, a developmentally disabled man, goes missing from a local diner near Greenbury, the entire community of the small upstate New York town volunteers to search the surrounding woods in hopes of finding him. High functioning and independent, Bertram had been on a field trip with the staff and fellow residents of the Loving Care Home when he vanished.
When no trace of the man is found, the disappearance quickly becomes an official missing persons case and is assigned to detectives Peter Decker and his partner Tyler McAdams. As their investigation deepens, the seasoned Decker becomes convinced that Bertram hadn't lost his way, but had left with someone he knew. Soon Decker...

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