While searching in Iceland for a missing sailor sought by an insurance company, the teen-age detective brothers uncover a plot threatening the life of a United States astronaut and the secrets of NASA's moon project.
Contents
Icelandic secret -- Thug for hire -- Ancient custom -- Astronauts' salute -- Boiling pit -- Tricked in the sky -- Harrowing blizzard -- Something fishy -- Man of the sea -- Arctic patrol -- Over the waves -- Mysterious offer -- Eavesdroppers -- Perfect disguise -- Bad break -- Boxes -- Shut in -- Divide and conquer! -- Hijackers! -- Cool hand Chet.