I am currently reading the Boris Johnson's biography, and I find it very biased, and shaped in a weird way (many flashbacks, ...). I am hoping to find another biography, maybe not much longer (I am not a native English speaker), but with more objectivity and even criticism of some of Churchill's actions. I would like to understand the man and his thinking throughout the events he encountered, not just hard cold facts. Thank you all in advance !

(I didn't find it in the book list in WWII biographies, hence my question)