The Chameleon (2010)

There once was a man named Frédéric Bourdin. Desperate to fill the voids in his life, he hit the road and lived not as himself, but as a number of different identities. But they weren't just figments of his imagination. No matter what his age, he specialized in orphans and young people, daring to even take on the identity of three missing children. In fact, Bourdin was so skilled -- at mimicry or maybe just preying on desperation -- that he even managed to convince one American family that he was their son, even with a French accent and the wrong color eyes.