Every year, Alice and her parents travel to Sanibel Island, Florida, to celebrate her birthday. This year is extra special because Alice is turning ten. She knows exactly what to expect, from the shells on the beach to the familiar faces of the people who always vacation there at the same time. But when they arrive, Alice discovers that her perfect routine is broken. Some of her favorite people are missing, and new, unfamiliar faces have taken their place. For a girl who loves things to stay exactly the way they have always been, these sudden changes feel completely unsettling. As her birthday week unfolds, Alice must learn to navigate the shifting sands of her beloved island getaway. She might even discover that growing up means making room for new friends, unexpected surprises, and the courage to embrace things that are different.