P.I. Anthony Rodrigo is a private investigator in Chicago, trying to fit in with law enforcement as a Spanish immigrant of the early 1930s. When a murder in one of the city's most popular underground clubs, he immediately tracks everyone who was there that night, and invites them back to the club, as a "refund" for getting their other night there spoiled. Everyone shows up, and now is his perfect chance to interrogate everyone, look for evidence, and get to the bottom of this crime.