Set in the lawless era of Prohibition, 91 Days is a gripping tale of vengeance that follows Angelo Lagusa, a young man who witnesses the brutal murder of his family at the hands of the Vanetti mafia. Years later, under a new identity as Avilio Bruno, he returns to the criminal underworld of Lawless City with a single, consuming purpose: to systematically dismantle the powerful Vanetti family from within. Blending the tense atmosphere of a classic gangster drama with the calculated precision of a revenge thriller, the series chronicles Avilio’s dangerous maneuvering as he ingratiates himself with his enemies, forging a fragile and volatile alliance with the late don's son, Nero. As the 91 days of his plan unfold, the line between ally and adversary blurs, forcing Avilio to confront the devastating personal cost of his bloody quest for justice.