It's 1955, and New Yorker Rose Bennington is ready to let her dreams set sail in a new direction. Losing her job as a secretary on the eve of her thirtieth birthday is the catalyst she needs to no longer squeeze herself into a life that doesn't fit. Society tells her she should focus on settling down. Her parents tell her she should follow in her twin sister's footsteps and marry a man who will be devoted to her. The trouble with those outside voices, though? They've been threatening to drown out her own - ­until now. When Rose reads a newspaper article about the SS Harmony, a transatlantic ocean liner, she's inspired to buy a one-way ticket on the ship. Maybe this is just the thing to help her discover what her heart yearns for most. She can't make any waves, after all, if she never leaves the shore. But what she isn't expecting is a whirlwind romance with a man she meets onboard - who, on their last night before the ship docks, writes her a letter that could change her plans entirely. More than six decades later, Grace Anderson stumbles upon that same letter in the Atlanta bookstore she co-owns with her sisters. With the shop struggling to make a profit and her sisters pushing to close its doors for good, Grace draws hope from the words penned so long ago. She's always been fascinated by stories, by the worlds they weave, and this letter is no exception. Even as she fights to keep the store open - and to open her heart, too, enough to say yes to the marriage proposal that seems to have paralyzed her - she can't stop thinking about that letter. Determined to unearth the mystery behind it, she sets out to track down the person who tucked it into the pages of a book for safekeeping. When she finally succeeds, though, the story arc isn't remotely what she's imagined. Will it convince her and her sisters to say goodbye to their family's bookstore once and for all, or will it be exactly what they need to realize that sometimes "The End" is really only the beginning?