Queenie is a cat, deeply aware of her own perfection, and Arthur is a dog who normally likes everyone (except Queenie who is devoted to making his life a misery), and they both live at the Blackberry Hill Inn in the Northeast in snow country with their human twins (Harmony and Bro), and Mom; but one winter's day an unpleasant and suspicious stranger comes to stay at the inn, and soon the twin's uncle is framed for murder--and Queenie and Arthur must put aside their differences and work together to solve the mystery and protect their humans.

Queenie, a cat, and Arthur, a dog, live at the Blackberry Hill Inn and don't always get along, but when a stranger stays at the inn and an uncle of the twins who live at the inn is framed for murder, Queenie and Arthur decide to work together to solve the crime.