Nancy stars in a horror movie about a monstrous River Heights urban legend — but is it really an urban legend? And will Nancy, Bess, and George live long enough to find out? Plus, it's double trouble for the world's greatest teen super sleuth in "Writ in Stone!" A sweet young boy Nancy has often babysat has gone missing, and while Nancy picks up the trail, a historic stone marker that may prove the Chinese discovered America before Columbus is stolen! Can Nancy solve two baffling mysteries at the same time, with all of River Heights watching?