A group rich aristocrats and bankers are bored with finding life too easy. Archie Roylance puts forward the idea of a challenge, by going to Scotland to poach a stag or salmon. They send landowners a challenge using the alias John McNab.
Archie Roylance is caught with a stag by Janet Raden but excepts defeat and leaves. When Professor Bandicott finds viking treasure, Sir Edward Leithen sneaks out to bag a salmon. The Gillies catch him but young Benji takes the salmon home.