When your nemesis is named Mamie Claire and stole your idea for a T-shirt line, only a psychic can chart your destiny.

That’s precisely where Brooke (Greta Gerwig) and her soon-to-be stepsister, Tracy (Lola Kirke), venture in Noah Baumbach’s latest, “Mistress America.” There, they are informed Brooke must travel to Greenwich, Connecticut, to guilt-trip her ex-fiance, now married to Mamie Claire, into funding her New York City restaurant enterprise. Will the duo take the bait? Find out in this exclusive clip. The screwball comedy, written by Baumbach and Gerwig in their first collaboration since “Frances Ha,” opens in limited release on Aug. 14.

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