Tales of the Bounty Hunters by various authorsThis book is a collection of five (not-so-short) short stories about the bounty hunters seen in The Empire Strikes Back: Boba Fett, Bossk, Dengar, IG-88, Zuckuss, and 4-LOM. It's a varied and interesting look inside the minds of these characters whose loyalty is neither to the Empire or to the Rebel Alliance.
The book's "Tale of Boba Fett" was written before the bounty hunter's childhood was revealed in Attack of the Clones, so there are some contradictions - however, many fans actually preferred this book's take on Boba Fett over the newer backstory from the movies.
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This is a classic era book from the Legends timeline. It will likely be contradicted by newer books (if so, just think of it as an alternate universe).