Cardiologist Dr. Kirk Martin continually crosses swords with Dr. Cliff Hamilton, so he is surprised when Hamilton asks him to care for him after a heart attack. When he is ready for discharge, Hamilton is found dead in his hospital bed, and Martin is suspected of murdering him.

After another doctor is found shot to death, Martin's girlfriend, nurse Janet Rush, reminds him to be careful because he may be next. Can he save his own life while searching for the identity of the real murderer?