The Imposter (movie, 2012)

It’s 1994: a 13-year-old boy disappears from his home in San Antonio, Texas. Three and a half years later, he is found alive, thousands of miles away, in Spain. Disoriented and quivering with fear, he divulges his shocking story of kidnap and torture. His family is overjoyed to bring him home. But all is not what it seems. Sure, he has the same tattoos, but he looks decidedly different, and he now speaks with a strange accent. Why doesn't the family seem to notice these glaring inconsistencies? It's only when an investigator starts asking questions that this astounding true story takes an even stranger turn.