To save her husband, she is capable of anything: start her own investigation, study the psychology of avengers, and master the art of predicting the next step of a madman. In St. Petersburg, a deranged criminal is at large—death threatens any doctor or nurse who once made a mistake in their lifetime. A black mark from the executioner is given to Agniya Smolskaya’s husband as well. What will outweigh— the power of her love or the destructive energy of hatred?