 Basically, metropolitan Calcutta had been plagued recently by the murders of quite a few influential businessmen who had all been killed by being shot with what resembled an Edison gramophone pin embedded in their hearts.All these individuals had been killed in busy areas of Calcutta in broad daylight while crossing the street.There were no witnesses to any of the crimes and no one had reported hearing anything unusual as would be expected from the release of a projectile from a firearm.