In harvest time of 1436, Joliffe's troupe leader falls, leaving his players to find what work they can while he recovers. Joliffe finds work in a hospital where he unfortunately has to deal with Mistress Cisily Thorncoffyn, a widow expecting to be endlessly waited on for her mostly imaginary ailments.
When patients begin mysteriously dying, Mistress Thorncoffyn loudly insists that someone is trying to kill her. With so many suspects wishing her ill, if not outright dead, Joliffe has no choice but to find out whose anger has turned to murderous hatred and whether-having missed their target-they mean to try again...