Alexei and Tatyana Malerovsky, the owners of the Violet Lace estate, invite their poor nieces to visit. Arina and Lesya have never received such an honor in their entire lives! But their cousin Polina was not at all happy about the arrival of her poor relatives. The sisters, blinded by luxury, were not offended by the cold reception, but already on the first night they heard a terrible cry coming from the walls of the mysterious castle! Arina and Lesya decide to find the answer to this phenomenon. Is life in a luxurious castle so wonderful? And why did the rich aunt, who did not know them before, suddenly show such cordiality?! Why were they invited? Unsolved family secrets, like a ball of lace, haunt inquisitive guests. Maybe they will still be able to unravel it?