Elixir

Elixir is the debut young adult novel co-written by American entertainer Hilary Duff with Elise Allen. It was available at booksellers on October 12, 2010. It is the first in a series of books that Duff became committed to write. Elise Allen collaborated on the first book with Duff, and became committed to work jointly with her on the others. The book is now a New York Times Best Seller.