Professor Liskeard

In the short story The Capture of Cerberus, Professor Liskeard is an eminent archaeologist. He gave Countess Rossakoff advice on the decor of her "Hell nightclub" in London and also spent much time there.

Chief Inspector Japp believed that the nightclub was being used as a venue for the distribution of drugs. Specifically, jewels, sometimes stolen jewels, were being brought in and exchanged for quantities of cocaine. During a police raid on the club, some emeralds was found in Professor Liskeard's pocket. Japp, however, told Poirot that he believed the old man had been framed. The professor was a member of many learned societies and had connections with the British Museum. The only thing he ever spent his money on was old musty second-hand books. Japp simply could not believe that he would be mixed up in the drug business. Poirot would later exonerate him.