Felicity and Alena find the proof showing that Oliver didn't kill Cayden's son... and Cayden demands that the heroes turn over his three former allies, believing one of them is responsible.

Oliver learns that the DA has another witness against him--Roy Harper. Team Arrow set out to find Roy and learn if someone is coercing him to testify. Meanwhile, Black Siren passes herself off as Laurel and claims that she's been in captivity for two years.