Most people are getting very deep here so i'll try suggesting some great reads which you might not find as daunting;
Sherlock Holmes - you cab get the complete collection in 1 book for about £10 these days. Absolute classic by Doyle, despite the slightly older language it is an engrossing and engaging page turner.
The Winter Queen - first in the Erast Fandorin series by Boris Akunin. Marvellously well written, clever plots with brilliant characterisation. Extremely witty and across the series the authors variety of styles are truly impressive.
The Book Thief/I am Messanger - both by Marcus Zusak and both, in their own ways, classics.
Game of Thrones - currently on tv and despite how well adapted it is it truly does no justice to, what I personally believe, to be THE best fantasy series EVER written. Perfect in almost every way.
Feast of the Goat - beautiful book written by Mario Vargas Llosa. Gives some great insight into the political situation in the Dominican Republic back during its revolution (something I previously wasnt even aware of) I found it filled with great characters and an interesting look at societies ran by dictators.
On another note, great thread, saw a few books in here I will be picking up myself next.