I need help finding two interesting novels which have the same theme that could be compared in an essay. Can any one suggest me any number of novels which would be worth reading and writing an essay about. I like reading murder and romance novels.

You could try comparing Ralph Ellison's Invisible Man with Richard Wright's Native Son.

Or Ray Bradbury's Fahrenheit 451 with George Orwell;s 1984.

There are many others:
http://als.lib.wi.us/Collegebound.html