From publisher blurb:
Highmoon Media Productions and MonkeyGod Enterprises present The Dancing Hut.
Peasants and nobles alike are frantic: The Tsar has fallen deathly ill with few viable choices for an heir. If the Tsar dies, his scheming twin sons will engage in a battle for the throne, thrusting Torassia into a civil war. But then a rumor surfaces that the Tsar's youngest son, Ivan, still lives.
It's up to the PCs to find the young heir before the Tsar's rivals reach him first!
The Dancing Hut is a d20 System adventure suitable for characters of 9th to 10th level.