Going to the international congress in Malta, cardiac surgeon Ulyana Loginova did not even imagine what adventures awaited her. At the hotel where she was staying, strange and mysterious personalities gathered, not at all related to medicine. Each of them, as it later turned out, pursues its own, not always legitimate, goals. On the second day of their stay on the sunny island, Ulya and her friend Dasha discovered the body of a new acquaintance, a cardiologist from England, John Riedl. The doctor was strangled, and his entire room was ransacked upside down - they were obviously looking for something in him, but they didn’t find it. And only “lucky” Dasha noticed next to John’s body an old medieval ring with the inscription in Latin “By Fire and Sword”...