Sixteen-year-old Jessamine Luxton is heartbroken. Her true love, Weed, the strange and intriguing young man who came into her life so suddenly, has disappeared.Jessamine suspects that her own father, Thomas, may have been involved. Thomas was obsessed with poisons and discovering Weed's secret understanding of dangerous plants. This suspicion and her own growing expertise with poisons have changed her. She is no longer innocent. So when Jessamine learns that Weed is alive and in danger, she will do whatever it takes to be reunited with him, including killing whoever gets in her way.