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Ever since they can remember, Anna and Beth have been best friends. They have relied on each other through careers, marriages, and children -- nothing could break the bond. Then cancer changes everything. When Beth passes away, Anna escapes to Martha's Vineyard to mourn in the solitude of the ocean and the dunes. But though the island seems deserted, she discovers that she is not alone. A persistent stranger appears with a series of shocking revelations and opens doors to the past that Anna thought were closed forever. Carried back on the tide of her memories, she begins to tackle the lingering doubts about her own life. The very foundations of her beliefs are shaken -- leading to a leap of faith that shows Anna the meaning of true friendship and true love.