the hardy boys travel to canada (somewhere near moosonee and moose factory) to solve the theft of the stuffed animals and to break up an industrial spy ring, which was the source of the leak of info coming from the lectrex factory in their hometown of bayport. as the boys piece together parts of this mystery, they solve the industrial spying case their father was working on, they solve the mystery of the coded transmissions on the ham radio bands, and they find out why a group was stealing the stuffed animals.