The third part of the adventures of the Kreegarrian fighter, Barrelia van Bier, and his friend Sean. Tunderstad, the central city of Efiim, was long considered impregnable, but now that belief is in question, since the combined forces of the northern and southern kings have approached its walls. After losing their armies in the Golden War, the ruler of Efiim calls mercenaries from all over the world to defend the city, including the most skilled Kreegarrian monks. However, before the siege begins—with stones and incendiary projectiles—strange and frightening events happen in Tunderstad. An unknown enemy declares war on the Kreegarrians, and to avoid becoming victims of deception before the decisive battle, Van Bier and Sean accept the challenge thrown at them from the enemy’s rear.