Doppelganger

Taking things a little out of order, this is the third story in the Bloodwater Mysteries series by Pete Hautman and Mary Logue. Set in the small town of Bloodwater, Minnesota; the main characters in this series are Roni Delicata, a high school newspaper reporter and Brian Bain, her younger partner in crime solving. In this story, Roni is surfing through a missing-child website when she sees an age-enhanced photo of a boy that looks exactly like Brian. At first Brian ignores the issue, but soon he can't help but be drawn into the unsolved disappearance of a boy who looks exactly like him. Plenty of plot twists, action, and humor, yet it is generally a fast light read.