A stalled twentysomething (Keira Knightley), smothered by her old clique from high school and sucked into a wedding engagement with her feet-of-clay boyfriend (Mark Webber), befriends an offbeat high schooler (Chloë Grace Moretz) and moves in temporarily with her and her perplexed but accommodating father (Sam Rockwell). This is the first feature that the talented Lynn Shelton (Humpday, Your Sister’s Sister) has directed from someone else’s script, and it often seems like a premise trying to graduate into an actual story. The movie is worth seeing only for Rockwell, an actor whose skill and versatility become more apparent with every role; in this one he masters the careful balance of sternness and amusement that made Cary Grant such a beguiling romantic lead. With Ellie Kemper, Jeff Garlin, and Gretchen Mol.