Years before Sophie and Josh Newman met Nicholas Flamel, two legendary warriors fought together for the first time. Billy the Kid and Scathach the Shadow. 
Now that lost story can be told . . .

Billy the Kid is immortal. And being immortal means following unpredictable paths. With this exclusive eBook, Michael Scott offers readers a never-before-seen short story from the world of the bestselling series the Secrets of the Immortal Nicholas Flamel: the tale of how Billy the Kid and Scathach meet for the first time and join forces against the unseen, deadly and eternally hungry vampyres who control the city of Las Vegas—where Scathach must face her greatest fear. 

Review

This one was so entertaining actually, since it gave a glimpse not only into Billy the kid life but on Scathach life as well, and the friendship they have is pretty cool actually and it was a good thing that they met in this particular time. 

I liked the pace of the story and the fun Billy was having with all of this troubles that went down with Scathach and the peculiar shadow over her heart.