In eighteenthcentury London, women across the city whisper of a hidden apothecary shop and it s mysterious owner, Nella. who sells welldisguised poisons to use against the oppressive men in their lives. Nella s dark world is no place for her newest patron, a precocious twelveyearold girl named Eliza Fanning, but their unexpected bond sparks a string of consequences that echoes through the centuries. Two hundred years later, aspiring historian Caroline Parcewell is running from her own demons when she discovers a clue to London s longunsolved apothecary murders. Caroline s upended present soon collides with an explosive history, binding her fate to Nella s and Eliza s in a stunning twist that transcends the barrier of time.