Chad wants to move forward with his and Whitney's relationship. Whitney won't break her promise to Simone. Chad decides it's time to move on. Whitney wonders if she's done the right thing. Troubled by a photograph that David took, Grace questions Eve. Theresa wants to go after Ethan. Ethan renews his friendship with Gwen and tells her it's not her fault that Theresa lied. Gwen still feels guilty, as she keeps mum about her revenge on Theresa. Believing Sheridan was the one who dropped off the keys to Beth's boat, Luis pounds on the door of the boat cabin. He's shocked when he sees who answers the door. A misunderstanding leads Luis to believe he was on the wrong track. Sheridan rushes after Luis. Brian, Sheridan, Doc and Liz head back to the island. Tabitha brings physical evidence of foul play to Sam. She is delighted when Sam begins an investigation.