Hardy-guttene og spionen på flyrute 101

Blurb

The Secret Agent on Flight 101 is Volume 46 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by Tom Mulvey in 1967. Mulvey was also responsible for editing other Stratemeyer Syndicate stories with aviation content.