Max, an old pal of Quincy from the Korea war, dies under very strange circumstances: He flew with his business partner Charlie in a small propeller airplane when suddenly the airplane failed and fell to the ground. Both men survived the fall as if by a miracle, nevertheless, Max got a bleeding wound. Charlie donated blood to Max , whereupon Max died after a brief time. Quincy stands before a mystery: The injury of Max was not so serious that he would have had to die. Was Max killed by his partner Charlie? For that's what the evidence shows, however, there are also circumstances which point to a poison attack on both men. And which role does young, pretty secretary Linda play when she wanted to marry old Charlie?