Rubicon by Tom Holland - history - no keep reading - of the downfall of the Roman republic. A most excellent book - the history of a most crucial period in western history told in a modern voice - "contemporary sensibility" it says on the back.
If you have any interest in history, politics, or even the historical figures - Caesar, Cicero, Pompey, Crassus and Cato - have a look at it. It reads like a novel - but is very well researched. There are constant modern parallels - especially with power struggles among elites and international gun-boat diplomacy (or rather a couple of well disciplined legions diplomacy) - but he never labours them - lets you draw your own conclusions
Next book Im going to read is also by Tom Holland- "Persian Fire" - about the build up to the battle of Marathon - which he claims has a resonance in the divide between west and east down to today..