A Case of Intrigue in Islington

During a disturbance at an agricultural show in London, a young man of foreign appearance is stabbed, his killer melting away into the crowd. First on the scene is reporter Freddy Pilkington-Soames, who's covering the show for his newspaper and is just in time to hear the victim's last words, warning of danger to a person by the name of Longstaff and begging Freddy to help.

Following a second suspicious death, and with only the young man's message and a crumpled newspaper clipping to guide h...