Before his death, a jeweler wrote a will in which he mentioned the famous diamond “Abbas Shah.” But when the heirs opened his personal safe, the diamond wasn’t there. Without wasting time, they turned to the detective Drongo, who, as everyone knows, can unravel even the most mysterious case. Drongo immediately established the circle of suspects and began discarding those who had a solid iron alibi. But unexpectedly, his list started to shrink for a different reason—someone began killing the suspects one by one…