Jack Costello is a retired cop and now private detective who lives in Miami, who handles a myriad of cases for unusual clients. At his side are old police buddy Sam Bosley and cartoonist-turned-amateur sleuth Jean Philippe Dumas, who is using Costello as an influence and has nicknamed the burly detective "Extralarge." In the second series, Costello faces other dangerous cases, again with Bosley and Archibald, the son of an old friend, who Costello amusingly nicknames "Dumas."

He is the champion. Not only of his sport. But for people. Now someone want's to destroy everything he has fought so hard to create. This evil comes in two forms, one human the other a walking nightmare. There is no turning back now. Hammerhead Jones is about to meet his destiny face-to-face inside an arena from which there is no escape.