Armed with a self-effacing manner and a lively sense of humour, Nicky quickly discovers that being a good cop doesn't always win you friends. Stuck away from the land of the living as a night detective, he learns that new friends are in short supply”the other detectives look upon him with suspicion and his boss DI Carter doesn't do much to make his new recruit welcome. Although his methods can, at times, be unorthodox, Nicky always tries to do the right thing, even if it does make him unpopular with his new colleagues.

The wise-cracking Fitz is a brilliant but flawed criminal psychologist with a remarkable insight into the criminal mind.