There is not A best book for me but several great books.
Among them:

The Brothers Karamazov - F. Dostoevskij

Dune -  F. Herbert

1984 - G. Orwell

Martian Time Slip - P.K. Dick
Various tales of H.P. Lovecraft
The Pickwick Papers - C.Dickens 

I can't give an exact answer, but among my favorite books are:

Lolita by V. Nabokov - it's amazing both in English and in Russian!

Wuthering Height by E. Bronte - I just adore it! Can read and reread it again and again

Watching English by Kate Fox - an ethnographical book about "Englishness", witty, funny and beautifully written. If you are interested in English mentality and way of life, it's probably the best think to read...))

Think Of a Number - John VERDON

It's "Jane Eyre" by Charlotte Bronte.

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