Frontier Justice
A sourcebook for running and playing in Blue Planet adventures or campaigns as either law enforcement agents, or criminals.
Frontier Justice is really two books in one. The first section of the book deals with the criminal elements on Poseidon and includes a useful list of criminal slang in use on the waterworld (my personal favourite is "fishing buddy": one who is in danger of being "cleaned" by the mob).
The second section of Frontier Justice gives detailed information on the major law enforcement agencies operating on Poseidon, their operating procedures and a guide to their professional slang. The third section of the book is a set of three interlinked scenarios, where the players can play either the criminals or the cops hunting them. There is also the option for one or two moderators to run it for two adversary gaming groups.