For a group of sophomores at Gardner High School, it turned out to be a class trip gone awry. For 15-year-old twins Christian and Rachel Sanderski, it was the opportunity to tell the truth. A zombie attack while the kids are on a ghost tour forces Christian to save a group of his friends. The events of the next day, though, lead to Chris and Rachel's admission - they are the long lost descendants of a legendary gunman who once called Tombstone home. Their mother had forbidden them from saying a word about their genealogy in order to protect them. With the admission, a weight has lifted from their shoulders and, with the help of their friends, Christian and Rachel battle the zombies in a late night brawl. But when the kids are told of the coming of The Three dead cowboys their ancestor had sent to Boot Hill Cemetery, they steel themselves for the fact that they may never return home. Action and adventure, friends lost and friends found. And love, too...