Once more those irrepressible Hadley children (The Mystery of the Jade Green Cadillac) join forces to solve a mystery. This time in pursuit of the legendary lost treasure which is said to be stored in the Tower of London, they inadvertently track down a gang and reunite a gifted young sculptor with the family he lost during the London bombings. A thoroughly likeable family, the four Hadley children range in age from eleven to eighteen, and their trail of sleuthing allows the reader a colorful vicarious tour of London, old and new.