Echo is programmed to be an ass-kicking backup singer for a Riana-like singer that someone is trying to kill. Sierra, the blonde Japanese girl, is assigned as her backup. They infiltrate the singer's agency separately and with no real difficulties, until it becomes apparent that Rianna *Wants* to die, and is encouraging her stalker/executioner. Said whackjob kidnaps Sierra, and so Echo endangers the singer to rescue the other active, and save the day. This they then do.
Meanwhile, in the Helo plot, Paul the FBI guy gets set up by his Russian Mob informant, and is shot and hospitalized.