Barely healed from his injury, the Sniffer must use his gift to help solve another crime. An unknown assailant shot three security guards in a supermarket. Clues from the scene of the crime point to the fact that this was a premeditated rather than a random act of violence. After going through security footage from the cameras in the supermarket, the Sniffer and Victor find that several hours of footage has gone missing. It becomes apparent that the answer lies within the missing parts of the tape but who can they question if all the witnesses are dead? Meanwhile the Sniffer faces another dilemma - he needs to prove that the serial killer who targeted him and Voskresenskaya (episode 8, season 1) is sane and should be convicted. He is successful: turns out that the killer had a surprise for the Sniffer in the form of a shank he intended to use in another attempt on the Sniffer’s life.
Everything seems to be going wrong in the Novikovs family. And it’s not just the withering relationship of the couple that’s to blame - problems that arise from their son’s autism as well as the aunt who became incapacitated after suffering a stroke are also in play. Tina helps the mother look after her son and the aunt. Once the son tosses a turned on hair dryer into the bath that his father is in. It all looks like an accident but in just a couple of days Mrs. Novikova is also found dead. Who is to blame for all the grief that befell the household? This time around the Sniffer will not only have to use his sense of smell but also try to understand how people with autism see the world. The psychiatric clinic that holds the serial killer (episode 8, season 1) sees a series of strange events - one of the security guards fires at the killer before taking his own life.
American IT Specialist Crosby flies in for an international conference on security. But once off the plane he never reaches his welcoming delegation. Soon it comes to the surface that the American is an agent for an intelligence service. A double agent. But the main problem is that Crosby doesn’t disappear by himself. The agent of a local intelligence service Lena vanishes along with him. It is only thanks to the Sniffer that we find out why the couple goes missing. In the end it will be up to the Sniffer to decide the fate of the runaways.