The Royal Book of Oz (1921) is the fifteenth in the series of Oz books, and the first to be written by Ruth Plumly Thompson after L. Frank Baum’s death. Although Baum was credited as the author, it was written entirely by Thompson. The Scarecrow is upset when Professor Wogglebug tells him that he has no family, so he goes to where Dorothy Gale found him to trace his “roots.” Then he vanishes from the face of Oz. Dorothy and the Cowardly Lion mount a search for their friend, but when that is successful, they will need to become a rescue party!

Gwendoline Wynn, our heroine, is an orphan-heiress who lives on the river Wye. She will live with aunt until she comes of age and her money. Vivian Ryecroft, our hero and a captain in the Hussars, is on a leave of absence in Herefordshire, salmon fishing on the Wye. Gwen and Vivian have a chance, and brief, encounter on the Wye, and Vivian is enchanted. Will our hero and heroine find love? Will it last?

A plant hunter, Karl Linden, and his brother Caspar are on their way to the Himalayas to collect the plants of that region. Many adventures befell the brothers and their guides, all of which led to their being trapped in the mountains. This is a story of their escape from those mountains. (Ann Boulais)

The Young Yägers, Hans and Hendrik Von Bloom, Groot Willem and Arend Van Wyk, are again on a hunting expedition. This time, the reader will find their old acquaintances in Africa, on the banks of the Limpopo River. Here our young adventurers are looking for sport and wild animals.

Willie Spence may have been a bit eccentric by most standards, but he had a knack for creating gadgets in his small workshop at his home on Cape Cod. Whenever he was 'ketched' by an 'idee' he had to see it to completion, and always did. His small cottage on the Cape had become a labyrinth of string and wires tacked here and there so as to make life a bit challenging for his housekeeper Celestina. But she and most everyone else among the coastal towns and villages loved the old man for all his eccentricities as Willie spent his waning years just waiting for his ship to come in.