In Times Three, Robert Silverberg presents a trio of variations on the theme of time travel.

In Hawksbill Station, political prisoners from the 21st century are sent on a one-way journey to the late Cambrian era—a half billion years in the past. Their struggle to survive the privations of this bleak, almost lifeless world forms the centerpiece of an account of loss, exile, and repression.

Up the Line is a comic/erotic romp featuring Judson Daniel Elliott III, Time Courier and tour guide to the wonders of the past. While on a routine assignment in ancient Byzantium, Jud unexpectedly encounters his true Heart’s Desire, and his well-ordered life slides into chaos.

In Project Pendulum, identical twins Eric and Sean Gabrielson become the primary participants in the very first experiment in time travel. From a fixed point in time, they move by equidistant, steadily increasing arcs toward both the remote past and the unimaginable future. Their alternating viewpoints constitute a portrait of the wonders—and terrors—of a constantly evolving universe.