This book continues the tale of Sam Vimes, Carrot, and the rest of the
watch. As before there’s a plot to give Ankh-Morpork a king rather than
a Patrician–but this time the powers who would be behind the throne have
realized that Carrot, rightful heir though he may be, has no interest in
listening to them. Consequently, they are carefully researching
(and constructing a lineage) for a most unlikely fellow. Meanwhile,
Vimes and his men are trying to track down a fiendish killer–who just
might be a golem.

This isn’t one of Pratchett’s better books, though it’s nevertheless
entertaining; I especially liked the bits about the consequences of
painting coats of arms from live models.