Pringle and his friends investigate the scroll's theft and discover that the professional-art-thief parents of one of the boys are responsible. Don also attempts to woo a mysteriously depressed young woman named Katrina Corelli (Ulla Strömstedt) away from her threatening boyfriend Angelo (Lyle Waggoner). After wresting the scroll away from Angelo and his dangerous cohorts, the boys secretly return the scroll to the museum to the relief of the repentant parents.