In the heart of the Himalayas, a curious botanist, Dr. John Rollason, decides to join an American expedition led by Tom Friend on a daring quest to discover the legendary Yeti, or Abominable Snowman. Initially intrigued by the scientific prospects, Rollason leaves his wife, Helen, at a remote monastery with a promise of a swift return. The team embarks on their journey equipped with state-of-the-art gear and cameras, hoping to capture proof of the Yeti's existence. Their guide, a local named Kusang, is deeply rooted in the lore and fear of these mythical creatures, offering a bridge between the tangible aims of the expedition and the ancient beliefs surrounding the mountains and their mysterious inhabitants.

As the group ventures deeper into the uncharted territories of the Himalayas, they encounter a series of unexplained phenomena and signs that suggest they are not alone. Skepticism and excitement within the team give way to tension and fear, as the realization sets in that they may be pursuing something far beyond their understanding. The stark beauty of the landscape contrasts with the growing dread of the unknown, challenging the resolve and beliefs of the explorers. The dynamics within the group begin to shift, revealing conflicting motivations and ethics, as they draw closer to uncovering the secrets held by the mountain wilderness. Their journey becomes not only a test of their physical endurance but also of their fundamental perceptions of the natural world.