The Saint In Palm Springs.

Simon Templar is asked by his friend to protect Peter Johnson, a man trying to transport a cache of rare stamps from New York City to his niece Elna, a tennis pro for a hotel in Palm Springs, California. Simon sets a trap at Joshua Tree National Park, where he is first accosted at gunpoint by Margaret Forbes, who turns out to be a foreign agent. The stamps are found in a pillbox, but Pearly forgets who owned it.