Calhoun is a Med Ship Man in the Interstellar Medical Services, trying to study and prove his way up the Ranks. So when he somehow ends up on the wrong Planet, his First thought is of how his career may suffer for this mistake.The next thing on his mind is how to Escape. Now the lone medical officer on A plague planet. Calhoun and Murgatroyd look for a way to stop the spread of the disease and get back home in this science fiction masterpiece by Murray Leinster.