Authored by John Gibson Lockhart, I first read this book more than 30 years ago in the Everyman Edition. The definitive biography of Napoleon, finely written in an engaging and authorative style. The "use of English" will, I am sure, be regarded by some as old fashioned, however, if you wish to read the highest quality writing, this will not disappoint.
Subsequent biographies have drawn heavily on the Lockhart edition, and even where they include sources unavailable to that author, they fail to match the energy and vigour with which Lockhart carries through the story of Napoleon's rise to greatness and his eventual fall.
Part of the delight of the book is how the author moves from a determined impartiality toward Bonaparte - determined as Lockhart was fiercely "British" and had to work hard to keep his regard of France as an international competitor, in check, to a grudging admiration for his achievement. Highly recommended.