In the 1930s, Angelo "Snaps" Provolone, a notorious gangster, makes a deathbed promise to his father to leave the life of crime and become an honest businessman. Struggling with this transition, Snaps faces numerous challenges on a single, chaotic day. His trusted accountant, Anthony, confesses that he has embezzled a large sum of money from Snaps and seeks his blessing to marry Snaps' daughter, Lisa, as restitution. Meanwhile, Lisa herself is entangled in a web of deception, pretending to be pregnant to encourage her family's approval of her secret desire to marry another man entirely.

Amidst these personal entanglements, Snaps contends with the arrival of various other characters who complicate his efforts to go straight. These include a tenacious police lieutenant eager to catch Snaps in any criminal act, a linguistics professor seeking employment, and a rival mobster aiming to take advantage of Snaps’ transition. With misunderstandings multiplying and secrets being revealed left and right, Snaps must juggle all these hurdles while keeping his pledge to his late father and ensuring that his family and associates remain safe and united. Through a series of comedic and farcical twists, the day unfolds in a manner that tests Snaps’ resolve and ingenuity at every turn.