Zoe is an assistant to Detective Davis Darvis, an incompetent amateur who does not appreciate her talents. When he accepts a case regarding an old woman’s stolen letters, he rejects Zoe’s proposal to help. She teams up with her friend Isaac in a race to solve the case before Darvis does, using her wit combined with Isaac’s botanical knowledge to aid their search. Their adventure brings them across an elderly pro-wrestler, a duck-obsessed cult, a knitting gang, and more as they try to find the lost letters.