“The Case of the Strangled Seven” by Preston Yorke (cover art by Jeff Cook)
(aka: Harold Ernest Kelly, of alias Darcy Glinto fame, etc)
NOTE: I read this book years ago and reported upon it to John Fraser, an avid Kelly researcher. I decided to freshen up on it, and copy the plot herewith as I wrote it up all those years ago.
A beat-weary constable stumbles upon a pair of strangled drug-gang distributors. He requests time off to investigate the area on his own. A lone member of the nefarious gang captures and binds him, and later sets fire to the hideout, with the intention of burning the constable. He escapes, with severe burns.
Meanwhile, our wonderful author abandons any pretext of surprising the reader about who the strangler is. A somewhat well-to-do businessman has lost his daughter to drugs, and has lost his grip on reality. He and some reliable professionals systematically hunt down the seven top members of the gang and strangle them to death.
His secretary learns the truth, so, he kidnaps her.
The constable continues to track the s.o.b.s who tried to snuff him. In the traditional climax he attempts to arrest both the businessman and leader of the outfit, (the former operates under the name of “Optimus One”). “Optimus,” who bizarrely has a sac of poison attached to one of his teeth, bites the businessman and dies a paralyzing death before the constable’s eyes. The businessman announces that there are notes in his office that will clear up the entire case, and then, he too promptly dies.