The Everygirls' Library series now adds to its annals six choice detective stories in which teenage feminine heroines from New England to the South to the West Coast exhibit their sleuthing talents to solve diversified mysteries. Patricia McCune, Florence Kerrigan and Kay Haugaard make welcome appearance through their respective offerings, The Blue Cap. The Christy Place and The Thief of Silver Spray. The longest story is first; Lee Priestly's mystery of international intrigue in which part of the Hungarian National treasury, secretly converted to diamonds, and hidden within steel jewels, is safely recovered by Karen, a Hungarian refugee living in the U. S. and her American friend, Persis. The Gallery of Art in San Francisco is the setting where Toy Ying Lee prevents the theft of a valuable and beloved Ch'ing vase, via Charlotte Hoffman's Love, But Not Too Much. Seth Harmon writes plausible explanations into his story of strange occurrences in the haunted house of an old river boat captain. Absorbing fare to fill several relaxed hours.