What did Romka encounter during the investigation of his cases? But a visit to his lonely grandmother puzzled him. An old woman is worried that someone is secretly breaking into her apartment. The young detective decides to put a seal on the door. But it turns out to be torn down, and apart from torn flower pots and rearranged books, there are no traces! This mysterious visitor isn’t coming here by air?! Romka has no choice but to contrive and set a special “trap”. And what?! It turned out that the “ghost” - a hunter of ancient jewelry - is walking around in... American sneakers! Now all that’s left to do is catch him...