The Vampire' s Promise // Fatal Bargain — Caroline B. Cooney

Six teens spending the night in a haunted house must make a chilling choice in order to gain their freedom from the vampire imprisoning them--choose the one among them who will be the vampire's next victim.

When you make a deal with a vampire, there's no chance to change your mind. Or is there?

Lacey and her friends just want some fun. And what could be more fun than spending the night in a creepy old house? Especially a creepy old house with a strange circular tower? It's all just harmless fun, right? Wrong!

A vampire lives in that tower, and he wants something before he'll let them leave. One of them will have to stay . . . and there's only one more catch. Lacey and her friends must choose the person who has to stay behind.