Up to 5 or 6 years of age, parents read me from the Little Golden Books series.
About 60 or 70 books.
Then I started to read them myself.
Then graduated to Enid Blyton and the Famous Five and Secret Seven
Birthdays and Christmas were eagerly awaited 'cos they generally provided another book in the series as a present.
Until Charles Hamilton writing as Frank Richards and the Billy Bunter series about the Greyfriars school.
Lead to my interest in Rugby Union, a sport I took up when I moved to the city and University.
Billy Bunter was followed by Captain W E Johns and the Biggles(worth) stories.
My eyesight put a stop to any desire/s for a flying career :-(
I had copies of virtually all these nooks, but they were in a backroom of my parent's country home;
and proved to be ideal fodder for whiteants (aka termites).
I still have a few half chewed books but that's all. :>((
From Biggles on, my eclectic habits lead to reading any book I could get my hands on.
I guess I enjoyed those by Dick Francis (especially), then Le Carre, Fleming, Brown, Clancy and others of this ilk.
So for my favourite book, I am hard pressed to name "one", but as a set which I still have in my bookcase at the moment, it would be those by the champion jockey Dick Francis. Guess I can most identify with these due to having handled and trained racing animals.
Apologies for waffling on, but (selfishly) in so doing a lot of enjoyable memories were opened (for me)