Investigators of the secret investigation of the Royal Quarter are faced with a new case. A young woman is found murdered on the street; the criminal stunned her and, with the help of some terrible instrument, took all the blood from the poor woman’s body. It quickly turns out that the unfortunate victim was the wife of an alchemist - Gilien from the House of Reis. And a few years ago, his previous wife was also killed. There are bad rumors about the Reis family that the alchemists used forbidden magic, where the main ingredient is the blood of young women. But Gillien himself is not in the city, moreover, last time he also had a 100% alibi! Istra and Eizek will have to solve many strange mysteries and unravel a case that other detectives have not been able to approach for more than two decades.