Billy the Kid and the Vampyres of Vegas

So I read this short story today while on my breaks at work. This novella accompanies the series written by Micheal Scott called The Secrets of the Immortal Nicholas Flamel. If you have read the series read this novella. It's very good and gives you more information of the immortal Billy the Kid and the vampire Scathach the Shadow. So far there a 5 books a new one is coming out this year and 2 novellas.