Author L.A. Graf brings us the last tale in the Janus Gate trilogy with Past Prologue. Captain Kirk has been thrown 19 years into his past while his younger self has been with his ship and crew for the past couple of days. The younger version of Kirk finally tells both Spock and McCoy which planet and time he had come from and they devise a plan that uses the future versions of Sulu and Chekov as an escort for the young Kirk. While 19 years in the past Captain Kirk and his father George Kirk are on the hunt for young Jimmy whom Captain Kirk knows is no were on the planet. But as the events of the uprising continue George Kirk begins to pick up human life signs on his tricorder which leads them to meet up with Sulu and Chekov and young Kirk. Then once they meet its a race in two time periods because the Enterprise under Uhura's command is forced to make sure that there is a window in the defense net that is being put into orbit of Tlaoil. While 19 years ago both Kirk, Sulu, and Chekov have to make sure that George Kirk and his son make it off Grex alive so that way his son can grow up to command the Enterprise. This is a great book and it ends in such a way that you would never think but I do highly recommend it for all Star Trek fans.