Sam Moore's little brother vanished fifty years ago. No body. No answers. What Sam has is a boatload of guilt, since he failed to accompany Billy on his final, fateful bike ride. While digging in his garden, Sam discovers a green marble with a startling secret--it whisks him back to his childhood, connecting him to Billy. Thrust back and forth through time, Sam struggles to unlock the secret of his brother's fate. When the FBI investigates remains found nearby, Sam learns of a serial killer with a grisly fifty-year record. Sam's certain it's Billy's killer. But what's worse, his grandson fits the profile of the murdered boys. Will the killer return to Sam's town to claim his final kill? Can Sam untangle the truth in time to save him?