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Ra's al Ghul gives Oliver 48 hours to find Sara's murderer... or watch as the League kills 50 citizens a day. Meanwhile, Ray tries to apologize to Felicity for kissing her, and Oliver discovers who Sara's killer is.
Barry travels to Starling City with Caitlin and Cisco, and ends up helping defend Lyla against an assassin determined to get his revenge on her despite Arrow and his friend's best efforts. In the past, Oliver is ordered to acquire information from a prison using whatever means necessary.
Arrow gets a stalker when a woman he once rescued decides to start killing criminals in the hopes that the two of them can be together. Meanwhile, Thea gets a new DJ and Ray invites Felicity out to dinner. In the past, Oliver helps Tatsu when Maseo goes missing.
A killer frames Ted for multiple murders, and Arrow tries to find out who is really responsible. Meanwhile, Felicity runs a blood test on Roy at his request. In the past, Tatsu reluctantly helps Oliver track down a missing envelope.
Felicity's mother Donna arrives in Starling City just as a terrorist group calling itself Brother Eye unleashes a wave of cyber-terror on the city. as Felicity struggles to find the villains, she realizes that they're using a computer virus that she created. Meanwhile, Oliver and Thea try to address their differences, and Laurel makes an error of judgment because of her guilt.moreless
Nyssa believes that Malcolm is Sara's killer, but Oliver isn't convinced. As they seek the truth, Laurel seeks revenge for her sister's murder and Roy tries to repair his relationship with Thea.
Oliver goes to Corto Maltese to bring Thea home, while Lyla asks Diggle to find a missing ARGUS operative. Meanwhile, Ray gives Felicity her first assignment.
Oliver and his team look for Sara's killer and the trail leads to an assassin, Komodo, who is methodically eliminating his targets. While they hunt down the killer, Roy tells Oliver why Thea isn't returning his phone calls. In the past, Maseo informs Oliver that he has to kill Tommy Merlyn.moreless
Now that Arrow has crime in Starling City under control, Oliver tries to have a personal life. However, he and Roy are forced to forgo their personal plans when a new Count Vertigo begins dealing drugs, and a charming scientist makes a bid for Queen Consolidated. Meanwhile, Diggle has a new child, Quentin gets a promotion, and Laurel joins Arrow's crimefighting efforts.moreless