From the guy who made "Man on Wire". Excellent documentary.
For those that don't know Nim is about a baby chimp that is raised as a human and taught sign language to see how it develops communication skills. I vaguely remember hearing something about this in the 90's. Like Wire, it is a real life story that feels like something imagined for a movie.
It was actually one book that was chopped up into three books because it would be easier to publish and sell that way. It was supposed to be volume one of a two volume set with The Silmarillion being volume two.