Labyrinth by Kate Mosse - Makes the DaVinci Code look like a masterpiece of literature.
His Dark Materials is an absolutely awesome trilogy that get better - it helps that you know some Catholic Dogma but its not vital.
Ive got a load of cheap books from the Works always a good place to look for some bargains - I'll give you a review of the ones Ive read when I get back next week.
I can recommend anything by Gordon Stevens (although hard to find now) Mill Millington's books "Things My Girlfriend and I have argued about" and "Love and other near death experiences" are, I think, a hoot. " A Year in the Merde" is rather amusing, Nelson DeMille and Lee Child are good authors if you like thrillers and then theres Jeffery Deaver, Kyle Mills, Michael Connelly, Eric L Harry and Jack DuBrul for some other not bad authors who very rarely write dross.
Stay well clear of anything with a greek letter in the title - it'll be pooh