Laurel reverts to her Black Siren ways and teams up with a new partner, Shadow Thief. Dinah puts out an arrest warrant on Laurel, but Felicity isn't convinced her friend is beyond redemption and calls in another friend to help. Meanwhile, Oliver and Spartan set out to learn who had Emiko's mother killed.

Two transit guards are murdered at the scene of a Team Arrow operation, and Dinah tries to determine the truth about who killed them.