ThisPerfectDay - Ira Levin
Set in a future where "Uni" the master computer controls all decision making - including who can breed. A future where genetic engineering and selective breeding attempts to standardise all humanity. Where everyone is a member of one big family. What do you do if you're a little out of the ordinary? What happens if you break free?
A fantastic book which I read at about the age of 13, reminiscent of George Orwell's 1984 and Aldus Huxley's Brave New World, but faster paced and more of a thriller.