Fangs of the Dragon — Grant Stockbridge

As a chemist breeds germ-culture in a test tube, so did the Dragon, an unknown murder genius to whom horror was a weapon and a toy, breed crime in the little town of Bethbury! Richard Wentworth was fighting a hopeless, losing battle, until -- with the Dragon virus spreading in his own veins -- he rallied his crippled band to invade the enemy's stronghold in a conflict certain to be his last!