"Three years ago, a collision between a fast-moving freight train and a school bus full of kids led to devastation and grief on an unimaginable scale. But a fresh clue leads San Antonio police detective Amara Alvarez to the unlikely conclusion that one of the children may still be alive. If she's correct, everything law enforcement believes about the accident is a lie. With time running out, Amara must convince others--and herself--that despite all...