Main Textbook

Modern Physics

by Paul A.  Tipler & Ralph A.  LLewellyn   

(W. H. Freeman - Fourth Edition)

Web site of the book:

http://bcs.whfreeman.com/tiplermodernphysics4e/

(There are many ancillary materials to the main text in this webpage and its links, and some of them will be assigned reading)

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Alternative:

Modern Physics

by Serway, Moses, Moyer

(Saunders College - Second Edition).

Alternative for the part of relativity only:

Special Relativity: A modern Introduction

by Hans C. Ohanian

(Physics Curriculum & Instruction).

Other Sources:

Concepts of Modern Physics

by   Arthur Beiser

(McGraw-Hill)