I made it through 80% of this classic mystery book before I all but died of sheer boredom. It's a very short book - about 100 pages - but it made for a slow and tedious read and I just lost interest in it. Jacques Futrelle was an American author who was on the Titanic when it sank
The basic story is that diamonds begin showing up, delivered anonymously to well-known diamond merchants. When it becomes known there has been more than one such delivery, the merchants meet and discover that each of the five of them has received an extremely beautiful and well-cut diamond that is identical in every way to the ones the others received. Once they're aware of the others, they receive further communcation assuring them the damond is real and is theirs to keep. All they have to do in return is to sell an improbably large quantity of diamonds - which will be supplied to them - and the hundred-million dollar profits of which sales will be delivered to a certain individual.
Despite trying to keep tabs on the man who is runnign this operation, he proves always to be one step ahead of them and the private detectives they hire. This was pretty much the entire story for this first 80%, and it was poorly-written, obvious in many cases what was going on, and with an appallingly presented German accent in one charcter which was frankly obnoxious and nauseating tor ead. I grew bored, as I said, and ditched it. I can't commend it.