A strange guy turns to the Information Services Agency for help. Dressed up like a farce actor, he calls himself the heir to an ancient Scottish family that is being hunted. Larisa and Renat would have taken his visit for a prank, but the next day they discovered the body of an unusual visitor in their own office. In the hand of the murdered man is an invitation to a ball at the ancient Glamis Castle. Masquerade costumes are required for participants. How will the forced reincarnation into the White Lady and Count Beardi turn out for the detectives? And how can they recognize the terrible rival under the guise of one of the guests of the ball?