Dr. Mike befriends a young Chinese woman who is posing as a man so that she can practice medicine in the tradition-bound Chinese community. Dr. Mike finds herself matching her medical skills against those of an elderly Cantonese herbalist when many members of a large group of Chinese passing through Colorado Springs looking for work fall victim to fever. She becomes attached to the herbalist's young assistant, whom he introduces as his grandson but who actually turns out to be his granddaughter. Both of them, and the rest of the Chinese community, are endangered by the actions of Hank, who tries to drive them from town because he fears they will cause an epidemic.