While living with her brother Hans and working as a private detective in eighteenth-century Bavaria, Gretel discovers a connection between a murder at the local car maker's workshop and a case involving three missing cats.

The small, sleepy town of Gesternstadt is shaken to its pretty foundations when the workshop of the local cart maker is burnt to the ground, and a body is discovered in the ashes. It is Gretel who notices that the cadaver is missing a finger. At first she does not see this as significant, as her mind is fully focused on a new case. Not that she wouldn't far rather be investigating an intriguing murder, but her client is willing to pay over the odds, so she must content herself with trying to trace three missing cats. It is not until she is further into her investigations that she realizes the two events are inextricably and dangerously connected.