In the middle of the Mongol steppe, punished by the extreme winter, inspector Oyun observes a pile of corpses of difficult interpretation: a rider and his horse lay crushed under the weight of a yak that looks as if it fell from the sky. Her boss, Yeruldelgger, is equally intrigued by the sight of a body on the pass of the Otgonteger mountain range. A series of discoveries push him to a clandestine investigation that will create tension within his team, reopen closed wounds with his daughter Saraa, and will prompt the intervention of the shaolin masters of the Seventh Monastery, where he grew up.