The Watch must rob the city's most secretive institution in a desperate effort to find the artifact.

In the race against Carcer for the second mystical artifact, Cheery, Angua and Carrot venture into the Mines of Tak. Cheery must confront the darkness in her past. Vimes and Sybil defend the besieged Watch House from Doctor Cruces and her Assassins.

Sam Vimes wakes up in an alternate universe where he's a prisoner in the middle of a jailbreak.