The Mirror Universe is a dark and twisted reflection of our own, where humans and Vulcans live as slaves to Klingons and Cardassians - an alliance long believed to be the creation of one man: the feared and hated Emperor Tiberius, the Mirror Universe counterpart of James T. Kirk. But just as Kirk survived his own age to live in the era of a new generation of heroes, so
Tiberius now returns to fulfill his mad dreams of total domination - not just of his own universe, but of Kirk's as well.
The story begins moments after the dramatic rescue of the Enterprise-E from a team of Mirror Universe infiltrators, when Kirk finds himself locked in a deadly battle with Tiberius - an enemy who knows Kirk's mind as well as he knows his own.
From the nightmarish landscape of the Mirror Universe Earth to the joys of impending parenthood and marriage to the woman he loves, the incomparable Teilani of Chal, Kirk is propelled into his most personal and dangerous mission as he fights to uncover the secret if Tiberius' return, and learn the terrible truth behind the madman's real plans for the Federation.
With Spock, McCoy and Scotty at his side, and reteamed with Jean-Luc Picard and the crew of the Enterprise-E, Kirk discovers an unexpected enemy within Starfleet itself - a mysterious group still guarding frightening secrets from Kirk's own time. And as Kirk fights to expose those secrets, his epic search becomes a deadly obsession that threatens all he holds dear, drawing him inexorably to a stunning conclusion that will forever change his life and his understanding of the universe.