Question: Jinnicky the Red Jinn makes a cameo in which twenty-ninth book by L. Frank Baum and his successors?
Sentence (from "The Wishing Horse of Oz"): The Wishing Horse of Oz (1935) is the twenty-ninth in the series of Oz books created by L. Frank Baum and his successors, and the fifteenth written by Ruth Plumly Thompson.
Relevant evidence: Yes