
FBI ace agent Batty bears an identical resemblance to mafia boss Barton Logut. When Barton dies, Batty is sent undercover to impersonate him and gather evidence of arms smuggling. Inside the Logut family, he faces power grabs from young master Luca and probing from stepmother Suzanne, surviving exposure thanks to a matching crescent birthmark. He develops feelings for Barton's wife Elise, recruits mixed-race bodyguard Haruko Kawashima, and secures the San Francisco docks. As he closes in with Deputy Director Helena, the operation collapses: FBI Director Burke is a mafia mole who ambushes them, wounding Helena. Batty fights through, killing Burke and Carlos. Dying, Burke reveals Batty and Barton were twins, taken as infants and raised as a mole within the FBI. As Batty faces his heritage, Helena's fingers twitch.





