Jack, an emotional wreck after the death of his brother, agrees to go to his friend Iris's family cabin on a remote island to get away and find himself. But upon arriving, he realizes that Iris's sister Hannah has also come to the cabin for the same reason. The two find themselves in a strange situation that takes an unexpected turn when Iris shows up unannounced the next day. "Your Sister's Sister" is a Turkish film that explores complicated relationships and unexpected connections in a heartfelt and humorous way.