A railroad Vice President and his chauffeur have sudden and mysterious seizures on the way to work; a family in New York city undergoes an epidemic of beri-beri; the American consul in the Virgin Islands collapses and dies for no apparent reason; a Wall Street speculator is apparently stabbed to death with a rubber dagger. Who other than Craig Kennedy, armed with his knowledge of chemistry, technology and Freudian psychology could solve these mysteries? This mystery/detective novel features Professor Craig Kennedy who is sometimes compared to as „The American Sherlock Holmes”. Armed with his knowledge of different spheres of science he begins another adventure to solve the mysteries.