Walls are going up. Nationalism and identity politics are on the rise once more.
Thousands of miles of fences and barriers have been erected in the past ten years, and they are redefining our political landscape.
Understanding what has divided us, past and present, is essential to understanding much of what's going on in the world today.
Covering China; the USA; Israel and Palestine; the Middle East; the Indian Subcontinent; Africa; Europe and the UK, bestselling author Tim Marshall presents a gripping and unflinching analysis of the fault lines that will shape our world for years to come.