Raffa Santana has always loved the mysterious Forest of Wonders. For a gifted young apothecary like him, every leaf could unleash a kind of magic. When an injured bat crashes into his life, Raffa invents a cure from a rare crimson vine that he finds deep in the Forest. His remedy saves the animal but also transforms it into something much more than an ordinary bat, with far-reaching consequences. Raffa's experiments lead him away from home to the forbidding city of Gilden, where troubling discoveries make him question whether exciting botanical inventions-including his own, might actually threaten the very creatures of the Forest he wants to protect.