The Poison Diaries: Nightshade by Maryrose Wood (Published by HarperTeen, October 25, 2011)
Sixteen-year-old Jessamine Luxton is heartbroken. Her true love, Weed, the strange but intriguing young man who came into her life so suddenly, has disappeared. How could he have left her with no farewell, and no word since?
Jessamine may not know why Weed vanished, but she does suspect that her own father, Thomas, may have had something to do with it. Thomas, who was so obsessed with Weed’s secret knowledge of dangerous plants that he would do anything to learn it. This suspicion—and her experiences with poisons—have changed her. She is no longer innocent, and now she has her own intimate knowledge of the power of the plants.
So when Jessamine learns that Weed is alive and in danger, she will do whatever it takes to be reunited with him.
She is, after all, her father’s daughter....
Book one of this series ended on a cliffhanger so I can't wait to find out what happens next!