Helena is back to seek vengeance, but Oliver still has feeling toward her. The Arrow must stop and kill her, but at what costs? Now that several of his closest friends know about his true identity, no one is safe.

After taking a mob accountant's laptop, Oliver plans to return the money to its rightful owners. Felicity however finds that Dominic Alonzo - the operator of an illegal casino and the head of a gang known for kidnapping - was paid $2 million to kidnap Walter. Arrow pays him a visit and is told that Walter is dead. He tells his mother and Thea but Moira rushes to Malcolm Merlyn demanding to know why he broke their agreement. He assures her that Walter is alive and will be released as long as she continues to cooperate. Oliver is listening to the entire conversation and now knows that his mother is involved, just as Digg had warned him. Flashbacks reveal Malcolm's plan and also the the sinking of Robert Queen's luxury yacht was no accident. Laurel meanwhile tries to make up with Tommy and finally learns the real reason he broke up with her.

As a new enemy emerges seven months after Slade's attack upon Starling City, Oliver battles with the help of his teammate Roy. However, with the Arrow's presence elsewhere someone he had loved dearly is hurt.