More than nineteen years ago, ATF special agent, Kane Delancey, witnessed his father's murder at the hands of an enforcer for the Boston mob. He put his past behind him when he and his family entered the witness protection program. Now, many years later, the murderer he testified against, is about to go free on a technicality. The FBI and US Marshals are asking Delancey to go undercover to help to stop the killer before he has the chance to tap his...