Wreath of Iron Dandelions

Ivan Pavlovich Podushkin loves spending time with a good book more than anything else. But by the law of meanness, every time a private detective gets cozy with a volume of his favorite author in hand, the doorbell rings and another client appears in the office. Today's visitor turned out to be Yuri Mironov, who is convinced that he saw his mother at the shopping mall. What's strange about that? Women love to shop. The only problem is that Ekaterina Semyonovna died a few months ago. Soon after, Yuri's mother-in-law and father-in-law also passed away. Moreover, they left in their sleep - heart attack, stroke. But they weren't ill with anything like that... Yuri suspects that their deaths could have benefited Andrei - Dusya's friend, his wife's sister. He is a sorcerer, a fraudster, swindles people out of money, and could very well have coveted the inheritance. Mironov asks Podushkin to expose the villain. And answer the question: what was his late mother doing in the store?