A mystery story with a good western background. A brother and sister from the mid-west taste their first experience in western life and plunge straight into adventure and mystery when they go to Phantom Valley for a holiday. ""Cap"" can't manage to keep out of hot water as she investigates every angle of this strange situation which is destroying the happiness of her newfound friends. A very effective wraparound jacket and better than average chapter decorations by Wm. Hamaker.