Publisher's Synopsis
It's double trouble for America's favourite girl detective when Owen Zucker, a sweet young boy Nancy has often babysat, is missing and a shorestone marker found on the coast of California, which may prove the Chinese discovered America in 1421 - before Columbus - is stolen. Will Nancy, with the help of her best friends George and Bess, be able to solve two baffling mysteries at the same time, while of all River Heights is watching?