The Black Lotus: Shadow of the Ninja
Of course, only the tweens can keep the world safe, but I did enjoy their background stories and their unusual powers. Ghost has that name because he can become invisible, Kate can talk to animals, and Cormac has super speed. Since they are all orphaned (Kate's family has been taken hostage), they bond in interesting ways. Ghost has a lot of problems, and is traumatized by the death of his brother. This explains why one of the villains is able to control his mind-- she talks to him in his brother's voice!
While readers with an interest in Japanese culture who have read Stone's Five Ancestors series or Hoobler's The Ghost in the Tokaido Inn will enjoy The Black Lotus, it should also be popular with fans of Black's Urban Outlaw series, Bradley's Double Vision, Korman's Masterminds and other fantasy adventure series where the only things standing between the world and utter destruction is a group of plucky twelve year olds.