Nightshade by Andrea Cremer is a young adult paranormal romance novel about Calla Tor, a teenage alpha werewolf destined to marry Ren, another alpha, to unite their packs. However, when she saves a human boy, Shay, and discovers hidden truths about her world, she begins to question her fate and the powerful forces controlling her life. Torn between duty and love, Calla must choose between the life she was born into and the one she truly wants.