Lavinia "Vin" Lucas is out of control and out of options. Stranded by parents who would rather use their average magical abilities to study dung beetles than raise her, Vin's been on her own for years. But she's never been able to corral her own powerful, unpredictable magic. After years of detention, suspension, and expulsion from magic schools far and wide, she's now being sent to the Last Hope School for Magical Delinquents. If she gets expelled, it's the end of the line.

Now, Vin is determined to behave. Except no one at Last Hope seems to want her to. Her new teachers--particularly the school's kind headmistress--push her to explore her magic, and her mischievous classmates delight in every accident. And all the while, a mysterious fire sprite, a suspicious instructor, and her overwhelming abilities might just sabotage Vin. But for the first time, she is not alone.

So when a former student begins attacking the school, Vin must question just how much she knows about the headmistress and her new home. Is this place worth saving? And are her budding abilities--and every trick, trap, and deception in her friends' delinquent arsenal--enough to protect Last Hope?