In the sprawling metropolis of World City, Detectives Frank and Fritz find themselves facing their most bizarre case yet.

A wave of overwhelming and seemingly mandatory happiness has swept through the population, leading to the unsettling phenomenon known as the "crime of happiness," where displays of anything less than utter joy are met with arrest.

As they investigate, they find themselves relying on a mysterious individual named Nancy, who seems to possess crucial insights into the source of this enforced euphoria and the secrets hidden beneath the city's relentlessly cheerful facade.