Top ten twisted histories

Christopher Edge is the author of the Twelve Minutes to Midnight series and other books.

For the Guardian, he tagged his ten favorite twisted histories (also known as alternate histories, counterfactuals, "what-if" fiction), including:Watchmen by Alan Moore and Dave Gibbons

Set in an alternate 1985 where superheroes are real, Richard Nixon is still the US president and the doomsday clock is