Adrian Chase kidnaps Susan Williams in Arrow season 5 episode 6. For a refresher on what happened last week, read my recap of episode 15.
Arrow season 5 episode 16 opens with Oliver Queen visiting Talia al Ghul. He tells her that one of her former students is trying to kill him.
Talia reveals that she helped Prometheus because Oliver killed her father, Ra’s al Ghul. She also tells him that Prometheus’ real identity is Adrian Chase.
Oliver returns to Star City and goes to the mayor’s office. He says he needs to know where Adrian Chase is and finds out that he’s in the conference room.
Oliver finds Adrian in a parking garage later. Adrian informs him that he has Susan kidnapped, so if Oliver kills him, Susan will die of dehydration and starvation.
Oliver tells Team Arrow about Adrian. John Diggle says, “We underestimated this guy.”
Oliver goes to Adrian’s house and tells his wife Doris that Adrian is the Throwing Star Killer and he needs her help stopping him. But, the SCPD shows up and surrounds him. However, he escapes when Diggle throws a smoke bomb.
At the bunker, Team Arrow watches a video fo Adrian threatening Susan. They can’t find any evidence of her location in the video.
Oliver threatens Adrian. He tells them that the second they find Susan Williams, he’s going to put an arrow through his heart.
Oliver returns to the bunker. He throws his Green Arrow costume on the floor and starts throwing around his equipment.
Diggle finds Oliver at the bunker. Oliver says that if he’s going to beat Chase, it’ll be by playing his game. He says, “I know someone who makes him vulnerable.”
Team Arrow arrives at the location where Prometheus was holding Susan in the video. They split up to canvas the building.
Oliver finds Adrian and faces off with him. Talia arrives. When Team Arrow finds the room where they were, both Oliver and Adrian are gone.
Team Arrow returns to the bunker. Diggle tells Felicity Smoak that they have to assume Adrian has Oliver.
At the end of the episode, Oliver faces Talia and Adrian. Oliver says that his friends will find him. Adrian says that he’s going to help Oliver discover who he really is.