Unnam revolves around five men - Lal, Asif Ali, Prasanth Narayan, Nedumudi Venu and Noushi. The group of five coupled with a corrupt cop named Sreenivasan plan a deal. However, the deal doesn't work out. Lal, who was linked to the underworld in the past, spends the rest of his days with the pleasant memories of his late wife. Asif Ali is like his own son. Prasanth has a flourishing hotel business and is rich. Prasanth is unaware that his wife Rima Kallingal and Asif Ali were in love with each other in the past. Swetha Menon runs a beauty parlour, has a son from her earlier marriage and lives with Nedumudi Venu, a gambler.