Don't let people, especially annoying critics, tell you too much about this true story that plays like a gripping psychological thriller. The facts are these: Nicholas Barclay, 13, went missing from his Texas home in 1994. Nearly four years later, Frédéric Bourdin, 23, shows up in Spain claiming to be Nicholas. So begins a story that nearly takes your head off with a series of amazements. British director Bart Layton combines interviews with Barclay family members and dramatic re-enactments to create a movie that offers hard speculation and harder truths. You won't be able to get it out of your head.