From New York Times bestselling author Allegra Goodman comes a post-apocalyptic novel about love, loss, and the power of human choice.

Honor and her parents have been reassigned to live on Island 365 in the Tranquil Sea. Life is peaceful there—the color of the sky is regulated by Earth Mother, a corporation that controls New Weather, and it almost never rains. Everyone fits into their rightful and predictable place... Except Honor.

She doesn't fit in, but then she meets Helix, a boy with a big heart and a keen sense for the world around them. Slowly, Honor and Helix begin to uncover a terrible truth about life on the Island: Sooner or later, those who are unpredictable disappear... and they don't ever come back.

Honor knows her family could be next, and when the unthinkable happens, she must make the dangerous journey to the Other Side of the Island—before Earth Mother comes for her too...