Jimmy Costello thought of himself as a good Catholic, a good father and a good copper - he wasn't. He was a corrupt and violent London CID Sergeant who, when his wife died suddenly of cancer, put a top villain in a wheelchair, got himself the quickest retirement on record and then disappeared. But where has he been for all these years, and why has he suddenly returned? Meet Jimmy Costello and find out how very easy it is to become one of Green's Bad Catholics.