One after another, two girls become victims of a maniac who tried to perform a lobotomy operation on them.

Antiques expert Rita Titova was found strangled in the park. Investigators establish that on the eve of her death, Rita met with the customer for the examination of silver spoons.

A young scientist dies of an overdose of a heart drug added to his coffee. Investigators go down the wrong path until they find out that shortly before his death, a scientist proved the fallacy of the scientific theory of a famous professor.