Books featuring Japanese wise guys in tacky suits and Hawaiian shirts, ideally something like The Friends of Eddy Coyle where its a dialogue heavy window into the world and the strange characters who inhabit the margins of society.

(Unrelated but I never understood this cover art, I spearfish myself and you can't eat parrotfish. They feed off the reef and carry ciguatera toxin that will paralyze you. They're trivial to catch as well, so I assume there is some /lit/ meaning to it.)