ALTHOUGH the dictators are integral to the narrative, Richard Overy, who is professor of history at King's College, London, has not produced a twin biography. Nor is it a straightforward history of Nazism and Communism.

Instead, Overy intelligently analyses both the similarities and the differences between the two regimes.

What resulted were real-life nightmares of violence, cruelty and death, where civil liberties were virtually non-existent.

We who are used to a liberal democracy, whatever its faults, should be profoundly grateful for what we have.

Anthony Looch