When Cass's estranged grandmother unexpectedly leaves her house and savings to Cass and her mom, it is just the thing they need to change their lives. Cass is being bullied at school, and her mom just lost her job—again—so they pack up and move in.

Cass finds an intriguing and powerful mask in her new room, and she is inexplicably drawn to it. A strange relationship grows between Cass and the mask; it sings her songs, shows her visions of past traumas and encourages her to be brave when facing bullies. The mask eventually leads her to discover her own Cayuga heritage and leads her into the arms of a community that's been waiting for them.