Fourteen-year-old Alice Evergreen returns with her parents to the city of Cascadia after many years of moving. She's certain she won't find any friends here either, but she's wrong: on her very first day, Alice meets teenagers who turn out to be the Guardians of the Forest—defenders of nature and people from the villain Oreso, who has sworn to destroy humanity. Unexpectedly, Alice discovers that she harbors the power of the Black Moth—the missing piece of the Guardians' team. Her voice is not just a talent, but a superpower capable of connecting with the Soul of the Forest and restoring its strength.