Show and Tell Sunday - Favourite Book(s)

Josie-Mary, how can I choose only ONE? It's Show and Tell Sunday, and dear Joe has asked us to post about our favourite book.
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Singular.
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I wonder how many people will manage just one?
Should it be the one I read and rely on most?

Or the only other one which is getting read on a daily basis this year?

Or the dry, witty, diaries that my mother taught me to love?

Or the diary that keeps my life in some vague semblance of order?

Which also holds sweet surprises from the boys..?Or the really interesting one which my mum gave me, which I really WILL post about soon, Sherri!

I can't choose one, Josie-Mary!

Can any of the others in Show and Tell Sunday? I'm off for a vist to find out...