The events center on a recent incident in London: the poisoning of a former Russian intelligence officer with a radioactive polonium isotope. This event forced employees of Scotland Yard, MI5, the FSB and private individuals to seek answers to numerous questions. Where did the dangerous substance come from in the capital of Foggy Albion? Where could a renegade emigrant come into contact with him? Was there an attempt on his life by chance or not? There are many questions, who will be the first to get to the bottom of this? Meanwhile, the tangled threads of the investigation stretch to the highest echelons of power...