Hardy Boys 12 Footprints Under The Window

A plot to steal a top-secret instrument vital to the United States space program poses a challenging case for Frank and Joe Hardy. After rescuing a South American stowaway who mutters a warning about “Footprints “ and then vanishes, Frank and Joe discover that documents belonging to their famous detective father are missing and that footprints linger under a window. The young detective’s 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.

Footprints lead to the breakup of a ring smuggling Chinese aliens. Published originally in 1933.

ATAC BRIEFING FOR AGENTS FRANK AND JOE HARDY MISSION: Good thing you're in Egypt, because we have a mystery on our hands. A man has been murdered, possibly over a map to a precious golden mummy. Could there be a curse surrounding the ancient mummy and his treasure? LOCATION: Cairo, Egypt, and the surrounding area. POTENTIAL VICTIMS: Anyone in pursuit of the treasure. SUSPECTS: Several people on an expedition are suspects. Find them before they find the mummy and the money. THIS MISSION REQUIRES YOUR IMMEDIATE ATTENTION. THIS MESSAGE WILL BE ERASED IN FIVE SECONDS.