The new client of private detective Tatyana Ivanova, Vlad Yakovlev, a wealthy businessman, a handsome man, has always been picky about people, but this did not save him from betrayal. Someone close to him poisons him day after day with a rare poison that cannot be detected by testing. Tatiana's investigation has reached a dead end. No one from Vlad's circle has a motive for the murder. And yet he is slowly but surely dying. But just six months ago Yakovlev was a healthy, full of energy man. It was then that the first symptoms of a strange disease began to appear. Now the businessman is in critical condition, the poisoner is enjoying the success of his crime. And Tatyana Ivanova has to check day after day everyone who had the opportunity to punish the handsome Vlad Yakovlev so cruelly and mercilessly...