The novel is a gripping espionage thriller set in the frigid, remote reaches of Siberia, where a secret scientific research facility, hidden deep within the vast and treacherous Kolyma region, draws the interest of Western intelligence. The protagonist, a brilliant and linguistically gifted Englishman, is recruited for an almost impossible mission: to infiltrate the top-secret installation, Kolymsky Heights, and uncover its mysteries. Disguised as a native Siberian truck driver, he embarks on a perilous journey through the icy wilderness, facing extreme weather, treacherous terrain, and the ever-present risk of discovery by Soviet authorities. His quest for knowledge becomes a harrowing adventure of survival and espionage, as he delves into the enigmatic purpose of the facility and attempts to relay its secrets to the outside world.

The novel is a sprawling epic that spans the period from the 1893 World's Fair to the years following World War I. It follows the stories of several characters including the anarchist Traverse family, a group of balloonists, a detective, and a mathematician. The book explores themes of anarchism, capitalism, and technology, and incorporates elements of science fiction, adventure, and historical fiction. It is noted for its complex structure and dense, multifaceted narrative.

"The Long Walk" is a harrowing narrative of a group of prisoners who escape from a Siberian gulag during World War II, and undertake a treacherous journey through the harsh Siberian wilderness, the Gobi desert, the Himalayas, and finally to India. The story is based on the author's own experiences and portrays the indomitable human spirit, survival against all odds, camaraderie, and the will to freedom.