Who set the suspicious fire over the furniture store? And who turned in the false alarm that sent the fire engines to the opposite end of town just when they were needed most? Judy's lively curiosity is working overtime as she considers these questions while waiting for Peter to come home. But curiosity gives way to real concern when Judy, telephoning Horace, hears the telltale click of the upstairs extension phone. She is not alone in the house! It takes courage to face the dark stairway, but Judy has what it takes; and what she discovers leads her into a deeper mystery. Judy discovers that the intruder is a young boy who is afraid of being arrested for something that he did not do. As Judy and Peter work to help Ken, they become deeply involved in fighting against social and religious persecution. A group of young people who call themselves the Wasps are fighting against change and against everyone who is different. Judy and Peter must find a way to stop the Wasps before the entire city is divided.