Jess' wild-child sister, Abby, pays a visit and immediately throws the loft into disarray. Meanwhile, Schmidt enlists Nick to be his wingman in crashing a bar mitzvah and Winston throws a dinner party with Bertie, which turns awkward when only Cece and Coach attend.

When Jess moves into Nick's bedroom, they both must deal with their complete lack of personal space. Meanwhile, Cece worries that Abby is taking advantage of Schmidt, while Coach worries Cece is treating him like one of her girlfriends. Also, Winston struggles with physical fitness.