When their mother passed away, Kaye and her sister Evie were each left with a stack of letters, one to be opened every year on their birthday; letters their free-spirited mother hoped would inspire them through adulthood. But now, after ten years away satisfying her wanderlust, Kaye wonders if she’s made the right choices after all—she’s neglected her relationship with Evie, she’s left the love of her life behind, and she suddenly finds herself without direction. But it turns out her mom’s letters contain a bigger surprise – a sister they never knew – that will shift Kaye’s life and love yet again.