On July 11th, 1897, three men set out in a hydrogen balloon bound for the North Pole. They never returned. This award-winning forensic investigation reveals their final hours. 11 July, 1897. Three men set out in a hydrogen balloon bound for the North Pole. They never return. Two days into their journey they make a crash landing then disappear into a white nightmare. 33 years later. The men's bodies are found, perfectly preserved under the snow and ice. They had enough food, clothing and ammunition to survive. Why did they die? 66 years later. Bea Uusma is at a party. Bored, she pulls a books off the shelf. It is about the expedition. For the next fifteen years, Bea will think of nothing else... Can she solve the mystery of The Expedition?