It depends on what "5 thick" is: 5 inches thick, 5 feet thick, 5 yards thick, 5 miles thick etc.
its more of a series but the twilight saga is a collection of thick books. you could also try the harry potter series but if your not interested in series id recommend the host by Stephanie Meyer.
it is about 5 foot thick.
1.5-5 cm thick
The 5 is thinner. The 4 is .28 inches thick, and the 5 is .24 inches thick.
5 to 8 KM thick.
Very thick, 3-5 feet thick.
The walls were 5 feet thick!
The painting was just a series of daubs of thick paint.
5 millimeters
5 to 25 miles thick
5 sm