Galen (Hugo Haas) has discovered a secret cure for a leprous epidemic which is slowly killing off the human race.
All that is necessary to stamp it out is to prevent contagion by segregating lepers and removing children from leprous parents, see that the general population has enough to eat .
A new vaccine offers hope against an ancient disease "He is a leprous man, he is unclean," says Chapter 13 of Leviticus.