Gr 5-8 This is an amalgam of mystery and problem novel in which the elements don't quite mesh. Tracy, insecure and shy since a childhood accident, has always followed her twin brother's lead. When their mother is arrested for robbing a jewelry store, the twins decide to find the real criminal. A series of Nancy Drew-style plot contrivances brings in the problem novel element. Early on, Doug is removed from action with a broken leg, so Tracy has to overcome her insecurity to continue the investigation. She interviews suspects who are surprisingly willing to talk. She follows the trail back to the family farm where she lived at the time of her accident. To have the criminals' hideout in the same abandoned well that she had fallen into as a child is stretching coincidence too far. Also, her use of handwritten Braille as a shorthand code is unrealistic, since Braille can not be written quickly with pencil and paper. Middle-grade readers deserve a more strongly-focused mystery. Elaine E. Knight, Lincoln Elementary Schools, Ill.