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Erica, a successful single mother, asked her twin daughters to take the train back to school in order to work. Unexpectedly, an accident occurred and her sister Christine died on the spot. Erica blamed herself for breaking the appointment for the sake of her career, but her surviving daughter Anne believed that the police had mistaken her identity and firmly believed that her sister was still alive. One of them lives in the shadow of guilt, the other is unwilling to face the facts, and the two of them drift away. At this moment, Erica received a mysterious anonymous letter that said "Finding the missing tranquility". This sentence came from the scrapbook she carefully made for her daughter many years ago - a notebook containing short quotes of life wisdom from her grandmother. Is Christine really not dead? Or is this Anne's way of trying to reconcile with her mother? Or is there something else hidden? All the answers are hidden in Erica's hometown on the west coast of Mackinac Island, where she spent an unhappy childhood and could not let go of her mother's mysterious death. When she returns to her old place this time, can she find her way home, to her daughter's heart, and to open her own heart?