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.

The murder of a veterinar woman is being investigated for suspecting that her client's horse is being used to transport heroin ...