The Secret of the Jade Ring — Carolyn Keene

Fleurette Garnier, a new student to Starhurst, puzzles Jean and Louise. The new French girl is reclusive and reluctant to join the new archery team, even though she is an expert archer. The mystery surrounding Fleurette deepens when Fleurette briefly disappears, and her room is ransacked.

Jean's jade ring, a precious heirloom, is stolen shortly before Fleurette arrives at the school and appears later at a pawn shop. The school's museum houses an imitation of a valuable jade ring which is also stolen. Fleurette becomes flustered whenever these incidents are discussed, drawing suspicion to her.

Although Jean and Louise believe that Fleurette may know something, they feel that the girl is honest. Fleurette refuses to talk, and the Danas hope that they can solve the mystery before something terrible happens to Fleurette.