"1348. As the Black Plague ravages Italy, Ginevra di Gasparo is summoned to Florence after nearly a decade of lonely exile. Ginevra has a gift--harnessing the powers of gemstones, she can heal the sick. But upon arrival, she is tasked with a much different mission: she must use her collection of jewels to track down a ruthless thief who is ransacking Florence's churches for priceless relics. If she succeeds, she'll never be accused of witchcraft again....