Book in Polish by P.K. Farion, Mateusz Gostyński. When Maja Nowicka suffers a nervous breakdown and her infidelity and the fact that she warned Artur Konop come to light, the woman falls into mortal danger. The man rushes to her rescue, reading the security password he receives as a desperate cry for help, but more adversity comes his way. The unsolved mercury case returns and takes a bloody toll. There are also answers to the questions still being asked. Bee and Snow are violently separated. They stand at a crossroads, and their dilemmas are not just an emotional swing, but a consequence of their past behaviour. They both come to a standstill at a point where all hope is lost and the only thing that seems certain is death. On the surface, they have written each other off and the other's well-being has ceased to matter. Nothing could be further from the truth. It turns out that the way they fought for each other was not the way they should have chosen. The right move can only be to stay by each other's side and do what they have done many times before - shield each other. After all, they know perfectly well that whenever they part, something bad happens. And it will be no different now. Oxygen is an extension of the 'Paradox of Virtues' series - a crime story with erotic overtones, set in the reality of Polish gangsterism. Farion and Gostynski join forces again in a duet that is a conglomeration of many genres. They start with crime fiction, action and sensationalism and end with a moral emotional treatise. They show that the beaten paths are not always the most valuable virtues, but sometimes you have to change direction to paradoxically achieve your goal.