For writing fiction and simply how to use words effectively: The way to write by Joan Moat http://www.amazon.co.uk/Way-Write-Ted-Hughes/dp/0140272704/

For understanding computer networking, Computer networks by Andrew Tanenbaum: http://www.amazon.co.uk/Computer-Networks-Andrew-S-Tanenbaum...

For physics (though old now), Feynman's lectures: http://www.amazon.co.uk/Feynman-Lectures-Physics-boxed-set/d...