A Flag Full of Stars (Star Trek, Book 54)

A Flag Full Of Stars
It has been eighteen months since the Starship Enterprise completed her historic five-year mission and her legendary crew has seperated, taking new assignments that span the galaxy.
On Earth, Admiral James T. Kirk has married and started a new life as the Chief of Starfleet operations where he is overseeing the refit of his beloved ship, now commanded by a new Captain -- Willard Decker. Kirk's only tie to his former crewmates is his Chief of Staff, a young Lieutenant Commander named Kevin Riley.
But Kirk's new, quiet life changes when he meets a scientist named G'dath who is on the brink of perhaps the greatest scientific discovery in a century. G'dath's invention could mean tremendous strides in Federation technology, or -- in the wrong hands -- the subjugation of countless worlds.
When Klingon agents capture this new technology, Admiral Kirk and Lt. Commander Riley are all that stands between peace and devastation for the entire Federation.