The Lost Apothecary by Sarah Penner

A female apothecary secretly dispenses poisons to liberate women from the men who have wronged them - setting three lives across centuries on a dangerous collision course.

Rule #1: The poison must never be used to harm another woman.
Rule #2: The names of the murderer and her victim must be recorded in the apothecary’s register.

One cold February evening in 1791, at the back of a dark London alley in a hidden apothecary shop, Nella awaits her newest customer. Once a respected healer, Nella now uses her knowledge for a darker purpose - selling well-disguised poisons to desperate women who would kill to be free of the men in their lives. But when her new patron turns out to be a precocious twelve-year-old named Eliza Fanning, an unexpected friendship sets in motion a string of events that jeopardizes Nella’s world and threatens to expose the many women whose names are written in her register.