Guards! Guards! Guards! by Terry Pratchett is a science fiction fantasy adapted for the stage by Stephen Briggs.

Terry Pratchett’s infamous city of Ankh Morpork is under threat from a 60-foot fire-breathing dragon, summoned by a secret society of malcontent tradesmen.

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, law-abiding and keen.

Aiding them in their fight for truth, justice and the Ankh Morporkian way are a small swamp dragon called Errol and the Librarian of Unseen University (who just happens to be an orangutan).

It is on at the Wharf Theatre, Devizes from tomorrow until November 1.