This second volume in the trilogy that started with Beautiful Creatures (2009) opens in the aftermath of magic Caster Lena Duchannes's climactic 16th birthday. Mourning the uncle who died in the fight between Light and Dark, Lena drifts away from narrator Ethan. When she runs away with her Dark cousin Ridley and mysterious supernatural motorcyclist John Breed, Ethan follows, jealous and heartbroken. Ethan's traveling companions are Mortals: Link, his dopey but loyal best friend, and Liv, a British exchange student training to be a sort of supernatural librarian. The three are outmatched and unprepared for the perils of the Caster underground but survive a number of deadly encounters, largely because outside parties show up at exactly the right moment. Besides its weaker and more hurried plot, this installment lacks its predecessor's sense of place. Nevertheless, readers eager to revisit Ethan and Lena's romantic tension and learn more about the Caster world and the Ravenwood family legacy will find satisfaction here. (Paranormal romance. 12 & up)