The Stone Witch of Florence

"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 hidden powers of gemstones, she can heal the sick. But when word spread of her unusual abilities, she was condemned as a witch and banished. Now the same men who expelled Ginevra are begging for her return. Ginevra obliges, assuming the city's leaders are finally ready to accept her unorthodox cures amid a pandemic. 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--the city's only hope for protection"--