Like a few others on here, the first trek novel I read was PADs Vendetta. I can't exactly remember when I bought it (due to there not being many Trek books in the British Library system where I live I very rarely borrow them and just buy them out right) but it was the rather tiny sum of £4.99 and even though I had to ask my Dad what Vendetta meant I was inspired by the fact it had a Borg on the cover to pick it up.