Curtis Caravaggio

On the heels of ViCAP uncovering the secrets behind the River Murders case, Clarice is imprisoned in an abandoned animal testing facility where she finds trafficked women being held captive.

Oliver brings Sara into the Arrow team. Watching Oliver and Diggle spar with Sara and talk old scars, Felicity starts to feel left out. The team is investigating a villain named William Tockman, a.k.a. The Clock King (guest star Robert Knepper), who is a brilliant thief armed with technology that can open any bank vault in Starling City. After The Clock King infiltrates the computer systems in the lair, Felicity feels pressure to prove her worth. When she gets a lead on Tockman's whereabouts, she heads out without the team, putting her in peril. Meanwhile, Oliver throws Sara a welcome home party, but Laurel refuses to attend. After Lance makes his case for a family dinner, Laurel acquiesces, but when Oliver shows up with Sara, she loses her temper on both of them.

When a perfectly healthy woman is found dead from a disease she never had, the Fringe team investigate the origin of this inexplicably fatal condition before it claims more innocent victims.