Грег Иган: The Arrows of Time

In a universe where the laws of physics and the speed of light are completely
alien to our own, the travelers on the ship Peerless have completed a
generations-long struggle to develop advanced technology in a desperate
attempt to save their home world. But as tensions mount over the risks of
turning the ship around and starting the long voyage home, a new complication
arises: the prospect of constructing a messaging system that will give the
Peerless news of its own future.

While some see this as a guarantee of safety and a chance to learn of their
mission’s ultimate success, others are convinced that the knowledge will be
oppressive or worse — that the system could be abused. The conflict over this
proposed communication system tears the travelers’ society apart, culminating
in terrible violence. To save the Peerless and its mission, two rivals
must travel to a world where time runs in reverse.

Continuing in the tradition of The Clockwork Rocket and The Eternal
Flame, Greg Egan’s Orthogonal trilogy has continuously pushed the
boundaries of scientific fiction, without ever losing track of the lives of
the individuals carrying out this grand mission. The Arrows of Time
brings this fascinating space opera to a close while offering insight into
human nature and the struggles we face, both as individuals and as a
species.