William Tockman orchestrates a precisely timed heist of Kord Industries and steals an electronic device that will allow him to access any bank vault in the world. His work comes to the attention of Oliver and Sara, who work together to try and stop him, foiling one of his robberies. In response, Tockman uses the device to hack into the computer servers at Oliver's hideout and overload them so they explode. Felicity, feeling left out with Sara now part of the team, attempts to bait Tockman into coming after one last heist. Oliver, Sara, and Diggle arrive in time to protect Felicity, but Felicity takes a bullet while saving Sara before stopping Tockman. Meanwhile, the Lances attempt to have dinner together and it is revealed that Sara and Oliver are in a relationship, much to the anger of Laurel. Later, Laurel reveals the reason for her anger to Sara and they make amends afterward, Laurel attends an A.A. meeting with Quentin. Slade makes his presence known to Oliver by coming to his home and meeting with Moira. In flashbacks, it is revealed that Sara befriended Sin after promising her dying father, a pilot shot down while flying over the island, that she would make sure Sin was safe.