True Grime by Natasha Deen
Grime cop and teen fairy Pepper Powder lives for one thing: protecting the human species from magical zealots who seek to eradicate them with Violent Illness of Unusual Resistance and Strength (humans call them “viruses,” but their mistake is understandable. The very young often get their words wrong.). When a terrorist leader releases a necrophage bomb, it not only decimates Grime headquarters, it turns Pepper into the magical world’s first fairy amputee—but she’s not going to let a little thing like a missing leg stop her. To catch her criminal, and prevent him from unleashing a V.I.U.R.S in one of the human world’s biggest shopping centers, West Edmonton Mall, she goes undercover as a human. But once Pepper's theories of humanity collide with the reality of bullies, cliques, and environmental destruction, will she still believe humanity's worth saving?