Jupiter Joyman is a young florist with a peculiar secret: his flowers have a way of making people extraordinarily happy. When Amalia Blackwand wanders into his shop and experiences a serenity she has long forgotten, an unlikely connection between the two begins to blossom. But as Jupiter comes to understand the pain Amalia has carried with her, he attempts to push the mysterious magic behind his flowers beyond anything he has tried before, giving shape to something neither of them was prepared to face.