The year is 1935 and Stephen, along with his brother, Kits, are part of a five-strong team of mountaineers that plan to tackle one of the world’s most dangerous peaks: Kangchenjunga. Kits quite literally wants to follow in the footsteps of his idols, those that attempted the mountain in 1907, known as the Lyell Expedition. Only two survived, with five men from the expedition dying on the mountain following terrible accidents and brutal weather. Though five died, only four of them were buried. As the plucky 1935 team begin their ascent, Stephen’s excitement ebbs away and is replaced with the haunting feeling that they’re not alone on the mountain.