"You could tag along if you like. It'll be dangerous.' She turned to look at him and peered over the top of her glasses. 'It might even be fun."

Billy the Kid and the Vampyres of Vegas: A Lost Story from the Secrets of the Immortal Nicholas Flamel - Michael Scott

This was a great intro to Billy. It was really fun to see him meet Scathach. It also gave some insight into Scathach and the rift between her and Aife. Billy shows his true colors when he decides to help the poor damsel rescue someone she once cares a great deal for. Of course, Billy soon learns that Scatty doesn't really need any help and really isn't the damsel she looks like. Great addition to a wonderful series!