Trust Me, I'm a Ninja — Natalie Whipple

"Just because you don't see them doesn't mean they're not watching. Life hasn't exactly been rosy since Tosh Ito and Amy Sato rid San Francisco of the Akuma Clan ninjas. They still can't control their powers, and no one really knows how to train them to be Inyo. Adding to their problems, Amy is distant and depressed and won't say why. Before Tosh can figure her out, the Akuma Clan makes a comeback. A gate to the kami realm is opened and strange creatures roam the city, causing chaos. Only Tosh and Amy can stop it, but they don't know how, and they haven't got time to learn. The gate is getting bigger, and something dangerous is waiting on the other side. Something hungry for the soul of an Inyo."--Back cover.