Two children enter a tunnel in an Arizona mountainside and come out in the magical kingdom of Meer where their arrival seems to fulfill an old prophecy.
A specialist in medieval English history, Charles Warren Hollister graduated with honors from Harvard University in 1951 and received his Ph.D. from UCLA in 1958. He was one of the founding members of the University of California Santa Barbara history department, where he taught until his retirement in 1994.
The co-authors of this children's fantasy novel were both members of the International Wizard of Oz Club, and Hollister also wrote one of my college history textbooks. The children Charlie and Ellen are transported from Arizona to the fantastic land of Meer, which has two moons in its sky and a good deal of magic. They make friends with a hermit and a minstrel and set out to defeat the Scarlet Sorceress who has deposed the old king, only to arrive when she herself is being deposed by one of her lords, forcing them to team up. Meer also has a dragon who shrinks at night and friendly dog-like creatures known as karfs. While not directly related to Oz, there were elements that reminded me of that fairyland.