With Ivy's help, Chuck discovers there is evidence incriminating his father and enlists Nate to help retrieve it. Serena volunteersto help Dan, but unexpected emotions arise.

Cast: Blake Lively, Leighton Meester, Penn Badgley, Chace Crawford, Ed Westwick, Kaylee DeFer, Kelly Rutherford, Matthew Settle, John Bolton, Yin Chang, Margaret Colin, Marc Kudisch, Zuzanna Szadkowski, Richard Phillips, Doreen Remen