I enjoyed the first book, Beautiful Creatures, immensely. It was an enjoyable romp through a magical small town with characters that, while stereotypical, were also quite lovable.
As much as I enjoyed it, I think I enjoyed book two, Beautiful Darkness, more than the first. The teen love story side of it is a backburner issue in this novel. Focusing less on the RELATIONSHIP between Ethan and Lena and more on ALL of the relationships in the story -- friendship, rivalries, great evils, powerful goods, family, sacrifices for loved ones, etc.
As the small group of tiny Mortals (Ethan, Link, and adorable new character Liv) and one special kitty (Lucille Ball) follow Lena to the ends of the magical world to save her, deep within the Caster Tunnels, bonds are explored in a much deeper fashion, and Ethan connects more people to the Caster world than in previous books. Apparently his life, family, and destiny has been intertwined with this world long before he was born, and he discovers that his fate is that of a Wayward -- a mortal with the uncanny gift of leading Casters (and sometimes Mortals alike) to their own destinies.
Looking forward to reading the rest of the series! You can pick this one up here: Beautiful Darkness.