Ethan Quinn offends the Dalton family protecting Willow Rivers. His needle uncovers a twenty-year-old case involving Sterling Pharma and embroils him in his master's sect, The Apothecaries' Guild, feuds. Secrets hidden by his master, Elias Yates, come to light. Su Qingli, Talia Thorne, and Willow Rivers join forces to uncover the truth behind the "harmful remnant formula." With his needle, he seeks justice for his family, loved ones, and patients.