It’s difficult to keep a crime series going after 11 books but Boris Akunin manages it well in All the World’s a Stage (Weidenfeld, £20). His hero, Erast Fandorin, is now in his fifties. It’s 1911 in Russia, and while the Bolsheviks gather their power, another revolution is taking place in the theatre, and the Noah’s Ark Company are at the forefront of this new expression.