When, for no known reason, a photographer snaps a picture of Biff Brewster playing chess with his uncle in a Berne hotel, a chain reaction is set in motion that eventually takes Biff higher than the highest Alps.

       Biff has come to Switzerland to join Uncle Charlie in a secret survey of the Swiss mountain railways and aerial tramways. But it seems that certain persons either know or suspect their objective. Why does the mysterious bearded stranger thrust a huge gold coin into Biff's hand in Market Square? And who is the sallow, scowling man who follows them in Interlaken? Most baffeling of all, how does the man they suspect manage to vanish from an aerial tram high over the mountain passes?

       Before Biff and his new friend, Tim Larken, find the answers to these questions, they have a hair-raising adventure, find time for some dangerous skiing, help rescue some mountain climbers caught in an avalanche, and wind up working for Interpol.

       Here's a story as fast-paced as a toboggan ride and as breath-taking. You'll love it!