In "Mistakes Can Kill You," we meet Johnny O'Day, who has had to make his way in a man's world since he was a boy. Half dead from pneumonia, Joe Redlin and his wife took him in. Their natural son, Sam, harbored plenty of resentment toward the kid. But now, Sam's in big trouble, and Johnny may be the only person who can come between him and a pair of gunmen. Twenty-seven, broke, and armed, Ross Haney is "The Rider of Ruby Hills." Ross thinks he might be able to settle down and make a good life for himself here. But the owners of the two biggest spreads are participants in a feud that promises to destroy Ruby Hills. Ross may have been alone when he arrived in town, but now he has allies and plans. . . Krag Moran rides for rancher Carol Duchin in the title story. With the threat of a range war between ranchers and nesters, the town is divided. Trouble comes to a head when Bush Leason shoots Shorty Grimes in the back. Now, Krag is sitting in front of the Palace Saloon, and Bush knows exactly why he's there.