"Blood and Chocolate" is a young adult novel by Annette Curtis Klause that tells the story of a teenage werewolf named Vivian. Struggling with her dual identity, she navigates the challenges of adolescence while dealing with her pack's expectations and her desire for independence. The plot centers around Vivian's romantic relationship with a human boy named Aiden, which complicates her life as she grapples with her werewolf nature. The novel explores themes of love, loyalty, and the struggle between personal desires and societal pressures within the supernatural context of werewolf lore.