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Chuck (Ed Westwick), Nate (Chace Crawford), Blair (Leighton Meester), Serena (Blake Lively) and Lola (guest star Ella Rae Peck) team up to uncover what they think is an explosive secret between Diana (Elizabeth Hurley) and Jack (guest star Desmond Harrington).
Meanwhile, Dan (Penn Badgley) is offered a prestigious fellowship in Rome for the summer. Matthew Settle also stars. Bart Wenrich directed the episode written by Jake Coburn.