The Mortons by Scott Westerfeld & Justine Larbalestier

The Mortons are a modern-day, old-money dynasty with impeccable taste, from their exquisitely crafted cocktails to their expertly tailored vintage garments. They are also stone-cold killers.

They, along with the other crime families, send their progeny to Helshire College, where legacy students learn to exercise control over their wealthy peers. Jessica Morton has always excelled at Helshire, secure in her knowledge that she is the prodigy of her generation. Now, having committed her first kill, it should be Jessica's moment, her honor.

But that kill will cut more ways than one - and it will set in motion a series of consequences from which there is no turning back.