What is the name of this foreign film?

It's about a boy whose poor family kidnaps the son of a rich family for ransom and keeps him captive in a hole. The son of the kidnappers finds him by chance and befriends him, but when he discovers that it was his own family that kidnapped his new friend, he plans his escape. I was told by a friend that it's in Italian. I saw it once in high school and I've been trying to re-watch it since. Please help.