Spanning centuries, 'The Lost Apothecary' intertwines the tales of Nella, an 18th-century apothecary who discreetly dispenses poisons to women seeking vengeance against oppressive men, and Caroline, a modern-day woman unraveling the mysteries of the past. When a young girl's error in Nella's shop spells disaster, the repercussions ripple through time, culminating in a convergence of lives that challenges the notion of justice and the power of women supporting one another across the ages.