Addison is a clever, cheerful girl, who is currently studying the crumbling castles of other countries. She creates colorful artwork on canvas and collects assorted animals. When Addison wins a creative writing contest, she must travel to Canada to compete. Once there, she discovers that her very own cousin, Corby Clemens, is her competition.
When Corby's cat disappears, he coaxes Addison into helping him look for clues. Corby believes it was a Cat Burglar until one of the clues points to his dad, Charles. As that is impossible, these two cohorts must work to clear his name. They call in the Royal Canadian Mounties to solve the curious case, and the commotion that follows creates a confusing Canadian caper!