A theatrical and booking agent. In 1928 during the affair of the Double Sin Hercule Poirot also aided Aarons in a small matter. Aarons assisted Poirot in finding Bella and Dulcie Duveen as part of the case of The Murder on the Links.
Mr. Aarons seems to be of the Jewish faith.
“If you want to know anything about the dramatic profession,” said Poirot, “there is one person who knows all there is to know and that is my old friend, Mr. Joseph Aarons.” Poirot and Aarons worked together in Murder on the Links, The Big Four and The Mystery of the Blue Train.