At twenty-seven, P.C. Cass Rickman, who grew up amongst a large family in a chaotic Liverpool terrace, had already been in the force for six years before coming to Sun Hill. Transferring to the Met gave Cass her first chance to live away from home and she arrived at the station full of such tremendous energy and enthusiasm that some of the older stalwarts of the squad found it both exhausting and annoying. However, with her quick wit and lively nature, she rapidly made friends. Her greatest fault was her lack of tact – she tended to open her mouth before thinking, and put her foot straight in it. But her redeeming blunt honesty and openness made it hard for anyone to take offence for too long.