BBC America: Captain Sam Vimes' life in the City Watch is changed forever when an impossible figure from his past returns to Ankh-Morpork. 20 years ago, Vimes watched his street brother and gang-leader Carcer Dun fall from a fatal height. Somehow, Carcer is back.

BBC America: Using the policing know-how of Constable Carrot, the Watch connects Carcer's evil plan to strange goings-on at the magical institution called Unseen University. Perhaps a missing library book has something to do with the dragon attacks in the city.

As fear of the dragon keeps people off the streets, The Watch must heist The Assassins' Guild