The Best Episodes Written By Seth Cohen

A former janitor becomes a potential key witness, but Peter and Sam struggle to track him down. Meanwhile, they examine a student trip to Costa Rica.

After the documentary goes viral, Peter deals with publicity and sorts through various fan theories. Video evidence from a party provides new clues.

Will, Frankie and Susan are joined by Will's new girlfriend as they head to Spain on a mission to retrieve a case of plutonium from the wrong hands.