Robbie Coltrane stars as Fitz, an alcoholic, gambling addicted, chain smoking, foulmouthed anti-hero, who has one saving grace - he is a brilliant psychologist with an uncanny ability to see the evil in people, make them confess and walk away unscathed. He seems to understand the criminal mind, most probably because his mind isn't that far removed from the criminals he deals with. And once he's found a crack, he can break them wide open...