Resentments fester when the White House is locked down after a suspicious substance is found near the Oval Office. Staffers must remain where they are---and with whomever they're with. This is bad news for Toby and Will, whose already-unraveling relationship is spiraling downward faster in the wake of a speech (written by Will) that Toby feels undercut Bartlet. Meanwhile, C.J. has career advice for Donna; Leo and Abbey spar over health issues; and Josh gets to know new NSC staffer Kate Harper.