Published in 1961, 'Doctor' by Murray Leinster is a science fiction novel that delves into the dangers of space travel and the fragility of human life. The story follows Doctor Nordenfeld, the physician aboard the interplanetary liner 'Star Queen', as he confronts a deadly virus called chlorophage after a mysterious girl named Kathy Brand boards the ship. Set against a backdrop of advanced space exploration, the narrative highlights themes of survival, sacrifice, and the ethical dilemmas faced by medical professionals in crisis situations.
