Robinson is an American publicist and salesman whose employers find his high-pressure techniques a little too intense. He is sent to London to watch the more sedate way of doing business there. He meets some titled distant relatives, Wontner and Esmond, who invite him to their estate for
the weekend. There he meets another aristocratic pair, Bruce and Collier, and their daughter, Deste. Also spending the weekend is Richardson, a successful stockbroker. Bruce and Collier have lost most of their fortune and their only asset of any value is an unexploited mine in Rhodesia containing
"Magnelite." Richardson offers to help them develop the mine in return for Deste's han...