Brown Girl in the Ring by Nalo Hopkinson (Warner Books--which I think is now owned by Hachette) is about Ti-Jeanne, who lives in a future, fallen Toronto, and bringing up Baby. She's left her boyfriend, Rudy, to move in with her grandmother, a woman who knows magic of nature and magic of spirits. It draws from Caribbean traditions, and deftly combines the unreal with the grittiness of the city. In the middle of it all, Ti-Jeanne has to fight evil within the confines of the city, and within the confines of her extended family. Chapters are organized with snippets of other work, like "Brown Girl in the Ring," which I only know as a children's game (and only kinda, but that's a long story about not understanding diagrams I had and only getting started on an interest in music/game traditions before I left teaching).
I think that this is a good introduction to Hopkinson's other work; she's got an impressive, thoughtful, and just plain excellent body of writing to dig into, too. (She's also a guest of honor at Sirens this year, and wow, are we fortunate to have her!)