Slipping on a banana peel and dying on the stairs of someone else's building - what could be more inglorious? A modest salesman of household appliances dies just before his own wedding. The bride can only complain about fate, but then... Sylvester Bessonov intervenes in the case - a man endowed with extraordinary abilities, who knows how to notice details and draws sensational conclusions from them. Sylvester declares that the death on the stairs is a clever, pre-planned crime, and undertakes to expose the villain. But as soon as he gets on the trail, he commits the next murder, leaving his “calling card” - a bunch of bananas - near the second corpse. Meanwhile, the inconsolable bride assures that she is being followed, and strange evidence appears in the case - a fragment of an old photograph, handmade earrings and a porcelain angel with a heart near the author's signature...