W hen you’re 12, anything is possible. In The Ability, M. M. Vaughn’s freshman effort for middle grade readers, we are ushered into a world where that statement isn’t comfortable hyperbole and young minds make mayhem for love and country. Twelve-year-old Christopher Lane’s life is every flavor of awful. Poor but on scholarship at a London private school, Christopher moves through his days friendless and failing, a target for unsympathetic staff and students alike. Home is worse. For years, Christopher has secretly maintained a household for his mother and himself as best he could, a necessity in light of his mother’s deteriorating mental state. Into this dank state of affairs (no kidding, there’s mold) breezes Miss Sonata with a test for Christopher to take,…