Dangerous Girls — R.L. Stine

Beautiful girls . . . Dangerous girls

Destiny Weller and her twin sister Livvy are beautiful, smart, and popular. But a summer at Camp Blue Moon changes their lives forever. When they return home from camp, Destiny and Livvy exhibit an inhuman craving to drink blood by night, compelled to satisfy their overpowering thirst.

Have they turned into vampires?

Can they keep their terrifying secret from their family and friends? Can they evade the vampire hunters who are determined to destroy them? Destiny desperately wants to find a way to stop the horror. Livvy is intoxicated by her new powers. Will Destiny regain her life -- only to lose her sister forever?