Footprints Under the Window

Books

A plot to steal a top-secret instrument vital to the United States space program poses a challenging case for Frank and Joe Hardy. The whereabouts of their famous detective father is a mystery, so Frank and Joe are on their own to foil the plotters. After rescuing a South American stowaway who mutters a cryptic warning about "Footprints," then flees, the boys learn they are up against a ruthless espionage ring. The next day Frank and Joe discover that documents belonging to Mr. Hardy are missing, and, noting strange footprints under a window, they suspect the stowaway. The young detectives' search for the diabolical mastermind of the "Footprints" spy ring takes them on a flight to a group of islands off the coast of South America. Here they risk the wrath of a cruel dictator, and also make a grisly discovery deep in the jungle. During a spine-chilling vigil in a cemetery, followed by entrapment in the flooded compartment of a wrecked ship, the courage and resourcefulness of the Hardys and their pal, Chet ...