The eagerly anticipated fourth series, begins with the nation’s favourite detective, the mercurial Sherlock Holmes, back once more on British soil, as Doctor Watson and his wife, Mary, prepare for their biggest ever challenge - becoming parents for the first time.
Paula and James are worlds apart. While they both live in Dublin, Paula is a well-respected science teacher whereas James scrapes by from day to day by doing maintenance jobs, stealing from his poorly mother, and sleeping with his clients. A frenzied one night stand between the two has a brutal impact on Paula's life.
Sam is a teenager boy who is on the verge of acting out hidden psychopathic desires while falling in love for the first time. He is someone who's not just on the brink of adulthood - he's about to act on a psychopathic urge to kill.
Enjoy all new shows brought to you first and on demand. Featuring award-winning talent in front of and behind the camera, BBC First delivers unforgettable stories that challenge, immerse and entertain.