Homeworld (To the Stars, Vol. 1) by Harry Harrison

"Jan Kulozik is one of Earth's privileged elite. A brilliant engineer, he enjoys all the blessings of a 23rd-century civilization which survived global collapse and conquered the stars. Then he meets Sara, the beautiful, desirable agent of a rebel underground dedicated to smashing the iron rule of Earth's masters. She shows him a sordid world he never dreamed existed! And suddenly Jan has to choose--between slaves and masters. His choice plunges him into a web of intrigue, assassination and betrayal that will lead him to death... or to the stars."--Pg. [4] of cover.