One autumn day in Moscow, banker Daniil and his adult daughter Alissa are attacked at home. A hired killer enters their house, Alissa mistakes him for her father's driver and takes him to the basement workshop. At that moment, a huge explosion occurs, after which the heroes find themselves trapped in the workshop, where the air becomes thinner by the hour.
In the second part of the film, the heroes search for the instigator of the attack among their friends...
