Young St. Petersburg artist Katerina has always painted bright canvases filled with joy and light. And suddenly, from her hands began to come pictures that even frighten her. She doesn’t remember how she painted them, she fears them, but she can’t throw them away. What is it? A mental illness? Someone’s bad influence? Or is there truly something otherworldly living in her apartment? Wojciech and his friends must find out — and this time the stakes are very high: either they will save Katya, or they will die together with her.