AllMovie

The "Sonny Steelgrave" story arc of Wiseguy rushes to a climax as the wedding of crime boss Sonny Steelgrave (Ray Sharkey) turns into a bloodbath. With both rival mobsters and the "feds" hot on Sonny's tail, undercover agent Vinnie (Ken Wahl) is determined to stay on the job and continue his charade as Sonny's best friend and confidante (which at this point may not be a charade at all). Hiding out from their enemies at a boozy bachelor party, Sonny and Vinnie ultimately engage in a highly revealng war of words, leading to a violent showdown--and a sudden and literally shocking death.