The Wildest West — Heather Beck

Sixteen-year-old Giz Barnwell thought her school-organized bus trip to Texas would be boring, but that was before they stopped in a strange place called Weaver Town for a re-enactment of the Wild West. There's something wrong with the re-enactment, though â€" something a bit too real. Now, three evil cowboys from the past are determined to rule Weaver Town, and they won't let anything, especially Giz, get in their way.