This collection of twelve stories features Professor Craig Kennedy, a brilliant scientist and detective who uses his knowledge of science to solve crimes. The stories are set in the early 20th century and offer a fascinating glimpse into the use of new scientific discoveries in criminal investigations. Kennedy's adventures are full of action and suspense, and each story features a unique and intriguing mystery. Whether he's tracking down a murderer using disappearing ink or investigating a series of seemingly supernatural events, Kennedy always brings his sharp mind and scientific expertise to bear on the case.