Your Sister's Sister Synopsis

Jack (Mark Duplass) is still trying to come to terms with his brother Tom's death a year earlier. At a memorial party, Tom's best friend Iris (Emily Blunt) feels sympathy for Jack and offers him the opportunity to stay at her family's island cabin so he can get away and find peace by spending some time alone.

However, when he gets there, he runs into Iris' sister Hannah (Rosemarie DeWitt) who is trying to get over the abrupt end of a seven-year relationship. The two spend the night drinking, then sharing an awkward sexual encounter. The next morning, Iris suddenly appears at the cabin and things become even more awkward.

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