any history book by Ben MacIntyre is a terrific read. He has written sseveral about WWII: I've read Agent Zig-Zag and Operation Mincemeat. He also wrote a good book about the spy Kim Phiulby, A Spy Among Friends.
Another great book about WWII is Citizens of London by Lynne Olson.
One of the best books I've read recently is Peter Frankopan's The Silk Roads that fills in the gaps of history for Westerners. Jaw-dropping details on almost every page--such as the real meaning of the Italian greeting ciao ("I am your slave") because Italian ports were the ceneter of the Roaman slave trade--they had to import 450,000-500,000 per year to keep the empire humming...and the origin of the word slave from the Slavs who were captured by the red-haired Vikings as they moved south...knowns as the Russes, who became known as the Russians..
some others--
The Swerve by Stephen Greenblatt
The Food Explorer by Daniel Stone
anything by Erik Larson but especially Isaac's Storm (about the Galveston hurricane of 1900) and In the Garden of Beasts (about the American ambassort to 1930s Nazi Germany)
Travels with Herodotus and Shah of Shas by Ryszard Kapuscinski
The Poisoner’s Handbook by Deborah Blum
Parisians by Graham Robb