In the Moscow region, on the bank of a river, a boy in hospital clothes was found in a state of shock. At the same time, the Russian Prosecutor General's Office received a letter from Professor Lenz, reporting bloody crimes that were taking place in one of the secret laboratories involved in human organ transplantation. An extremely complicated case is entrusted to the "important" A. B. Turetsky and his friends from the General Prosecutor's Office and the Moscow Criminal Investigation Department.