'Buck' is the kind of sweet, easily enjoyable film that grows on you. It might focus on the inspiration for Robert Redford's 'The Horse Whisperer,' but it doesn't have the Hollywood buzz. It doesn't have the media fervor of documentaries like fellow man + animal feature 'Project Nim.' It doesn't have the marketing whirlwind Morgan Spurlock and 'The Greatest Movie Ever Sold.' What it does have is heart, and a lot of it, as both an exploratory piece about one man's rise from abuse to happiness and success, and as a film that feeds on our interest in the communicative divide between human and animal.

There's a certain awe-filled curiosity that follows animal whisperers as they magically cross that separation and communicate effectively. In recent years, that curiosity has only increased as Cesar Millan ('The Dog Whisperer') travels across the U.S. taming the meanest and most unruly of dogs. 'Buck' follows Dan Brannaman as he travels across the U.S., teaching horse owners how to kindly and compassionately train their horses to obey even the most minute commands.