Here is the link to download free pdf of the book:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://static.sariputta.com/pdf/tipitaka/788/the_life_of_the-buddhapdf.pdf&ved=2ahUKEwiVlJTZ7LP-AhVdmGoFHT4yA4IQFnoECBgQAQ&usg=AOvVaw3npTxWDNGsJKqwGEWa3lfh

The book is a collection and amalgamation from several Buddhist literature like tripatika, abhidhamma, etc. Bhikku Nanomoli was an British WW2 pilot.

After war, he went to Sri Lanka and became a monk in Theravada school. He wrote one of the first English translations of Pali cannons and introduced Buddha to the West.

It is interesting that all his fellow monks are amazed by his works because as an English man learning Pali language for four years, he translated most of them very precisely to English in those four years while learning itself. Later on, he died suddenly in his 50s without publishing. 

After 2 decades, the successive monks identified his work scattered on his table and gathered them into a book and published it. I am stunned by the level of scholarship this monk had and indeed he was Pali scholar in his previous lives.

I have read other Buddhist books by renowned scholars but they get too analytical on details and language and miss the elegance and flow of Buddha energy to the readers, Bhikku Nanomoli had that free hand of transferring the Buddha energy and still maintain the precision. I liked the 8 fold path presentation and energy in this book much better than any other presentations/books, I have read before.