Guards! Guards!

Defending Ankh-Morpork against this threat is the entire underpaid, undervalued City Night Watch – a drunken and world-weary Captain, a cowardly and overweight Sergeant, a small opportunistic Corporal of dubious parentage… and their newest recruit, Lance Constable Carrot, who is upright, literal, and keen. Aiding them in their fight for truth, justice and the Ankh-Morporkian way are a small swamp dragon and the Librarian of Unseen University (who just happens to be an orangutan).