By Franklin W. Dixon
Deepest investigator Fenton Hardy enlists the help of his teenage detective sons in a look for a lacking guy being sought by means of an assurance corporation. All ends up in the sailor’s whereabouts have petered out and the lads fly to Iceland, the man’s fatherland, hoping to discover a brand new clue. From the instant Frank and Joe arrive in Reykjavik, the capital urban of Iceland, they're in consistent danger. within the spine-chilling pursuit that follows, Frank and Joe discover a diabolical espionage plot that threatens the lifetime of a U.S. astronaut and NASA’S moon undertaking.