Read: Star Wars episode I journal: Darth Maul, by Jude Watson, 2000, 0439139414.
This is a short juvenile novel. I reserved this because it is about Darth Maul. The novel is written for an elementary school aged audience so there is not a whole lot going on. There are only 97 pages.
Narrated by Darth Maul, Journal, has information about his relationship with Darth Sidious, his training, his thinking and goals, his origin.
I'm thinking about looking around for other Darth Maul novels. There should be a couple out there unless Lucasfilm is still wasting the character by only licensing kid novels.