Stolen in Death by J.D.Robb

A blow to the head with a block of amethyst has left multibillionaire Nathan Barrister dead-while nearby, a vault, its door ajar, sits filled with priceless paintings, jewelry, and other treasures and yet only one item seems to be missing. Is this a simple case of a burglar caught in the act or does Eve have a much bigger, bloodier mystery to solve...?