well this is a good thread actually, there are many books I have read that I wish everyone I know and I don't know would read, certainly not force them but one wishes he could
1- ALL the works of the great Arabic polymath Abbas El-Akkad (1889–1964) I have no idea which you must start with it depends on your field of interest, he wrote in philosophy, religion, literature, poetry, criticism, history, biographies, politics, sociology and many diaries!
2- Les Misérables by Victor Hugo (1802–1885).
3- Wuthering Heights by Emily Bronte (1818-1848).
4- many of Agatha Christie's (1890–1976) works, two in particular are a must: (Murder on the Orient Express - And Then There Were None) they are simply brilliant.
5- As the Crow Flies by Jeffrey Archer (born 1940) just because it's the last book I read
it's really great though.
those are the main ones, I should make a list of all the books I recommend one day
but those top my list.