Myrtle Hardcastle - twelve-year-old Young Lady of Quality and Victorian amateur detective - is back on the case, solving a string of bizarre murders in her hometown of Swinburne.

When the proprietor of Leighton's Mercantile is found dead on the morning his annual Christmas shop display is to be unveiled, it's clear a killer had revenge in mind. But who would want to kill the local dry-goods merchant? Perhaps someone who remembers the mysterious scandal that destroyed his career as a professor and archaeologist. When the killer strikes again, each time manipulating the figures in the display to foretell the crime, Myrtle finds herself racing to uncover the long-buried facts of a cold case - and the motivations of a modern murderer.