It doesn't take much for private detective Richard Diamond to agree to investigate the murder of cowboy, Clay Baxter's brother, just the offer of $1000 on top of his usual $100 a day fee. Clay is not convinced that his brother was thrown from his horse and banged his head accidentally killing him. His brother was a good rider and had a horse that was not easily spooked so things just didn't add up especially as his brother was a wealthy man and his wife was about to inherit his millions.