In a society determined to keep her under lock and key, Tavia must hide her siren powers. Meanwhile, Effie is fighting her own family struggles, pitted against literal demons from her past. Together, these best friends must navigate through the perils of high school's junior year. But, everything changes in the aftermath of a siren murder trial that rocks the nation, and Tavia accidentally lets out her magical voice at the worst possible moment. Soon, nothing in Portland, Oregon, seems safe. To save themselves from drowning, it's only Tavia and Effie's unbreakable sisterhood that proves to be the strongest magic of all.

Tavia is already at odds with the world, forced to keep her siren identity under wraps in a society that wants to keep her kind under lock and key. Nevermind, she's also stuck in Portland, Oregon, a city with only a handful of black folk and even fewer of those with magical powers. At least she has her bestie Effie by her side as they tackle high school drama, family secrets, and unrequited crushes. But everything changes in the aftermath of a siren murder trial that rocks the nation; the girls' favorite Internet fashion icon reveals she's also a siren, and the news rips through their community. Tensions escalate when Effie starts being haunted by demons from her past, and Tavia accidentally lets out her magical voice during a police stop. No secret seems safe anymore, and soon Portland won't be either.