The Descent

After a tactical group infiltrates the DSR and steals all the Rambaldi artifacts, CIA director Hayden Chase discovers that the alarms at the DSR were disabled from Nadia's computer, allowing the raid to happen. Mrs. Chase shows up at the apartment to question her. Soon Sloane and Jack arrive and suspect that Sophia, who had access to the computer while she was living with Sydney and Nadia, is in fact Elena Derevko. They follow her trail to a dead Rambaldi follower, a stunning betrayal, and a presumed dead family member when in a surprising twist, Sydney and Nadia learn that Irina Derevko is in fact alive.