The mobster Vincent 'Vinnie' Antonelli is under the witness protection program and the FBI agent Barney Coopersmith is assigned to take Vinnie and his wife Linda to a house in the suburbs. However their wives leave Vinnie and Barney and the agent gets closer to the gangster and befriends him. Vinnie is a bon vivant and a crook and does not keep the necessary low profile. The District Attorney Hannah Stubbs arrests him but Barney releases him from jail since he needs to testify against the Mafia. Soon Barney falls in love with Stubbs, but Vinnie gets into many troubles calling the attention of two hitmen from the Mafia. The police officer Crystal Rybak protects him and they also falls in love with each other. In the end, the good-hearted Vinnie becomes a prominent personality in the suburbs.