A mysterious death during a summer festival forces a retired cop and a magic-user to team up. Mac O'Malley, a retired Chicago detective, and his partner Millie, who possesses magical abilities, find themselves investigating a suspicious demise that occurs in the Fox River. The investigation takes place amidst the vibrant atmosphere of Geneva, Illinois' annual Swedish Days festival, where they must use Mac's deductive reasoning and Millie's spells to uncover the truth.

The premise sets up a classic cozy mystery with a unique twist, blending traditional detective work with supernatural elements. The Swedish Days festival provides a colorful and potentially deceptive backdrop for the unfolding events. Readers can expect a lighthearted yet intriguing puzzle as Mac and Millie navigate the complexities of the case. The dynamic between the pragmatic detective and the magic-wielding partner suggests a charming and engaging narrative.