Suspecting successful children's writer Maria Pogrebizhskaya of involvement in the murder of journalist Maxim Seliverstov, private detective Anna Svetlova follows her to the resort, where she hopes to find out in a relaxed atmosphere some details of the relationship between these two people. However, she suffers a complete fiasco: the writer, looking at Maxim’s photograph, declares that she is unfamiliar with this man. But Anna feels that Pogrebizhskaya is not saying something! And soon they slip Svetlova a jar of poisonous cream, try to drown her in a grotto, push her from the fortress wall... Now Anna will never back down, it becomes a matter of honor for her to find the journalist’s killer...