Gunfight at Last Hope Canyon. The Legend of Boot Hill, #4

With Rudyard Crosby's plans for the Eagle Heights mine destroyed, Gideon Pierce is free to put right his greatest mistake. His decision to pursue Warner Gray and not to stay with Messina Doyle ultimately led to her death, but now it seems that she might not be dead, after all. To find her he must track down the legendary bandit gang that once terrorized Last Hope Canyon known as the Sky Riders. When Gideon finds a way into the Sky Riders' heavily-guarded territory, the shocking truth he uncovers there could not only bring an end to his quest, but to his life as well.