Can there be a magic bullet?

The quest for a magic bullet is to find a drug which can cure disease and do no harm.  Microbiologist Adam Knight finds that the new antibiotic, Floracillin, he has discovered can cause cancer.  He falls in love with a young talented singer, the daughter of the head of a pharmaceutical company who wants to acquire the commercial rights to Floracillin. 

But he becomes responsible for other bullets.  Those that come from Kalashnikov automatic rifles and can shatter lives.