Everything you need to understand or teach All Cats Are Gray by Andre Norton.
There are three mysteries to be solved in "All Cats Are Gray." The first is the mystery of Steena's personality. She is silent most of the time, but when she speaks others listen carefully. She has identified great riches for those who would have them, yet has avoided taking advantage of her own knowledge of where fortunes are made; she has even turned down offers of rewards from the grateful people her ideas...