Originally Posted by
ChrisIII
It pretty much covers from shortly after ROTS to a year after ROTJ, at the battle of Jakku. Basically two people grow up together, go to the Imperial academy etc but when the war starts, one remains loyal to the Empire (despite knowing that it's kind of rotten) while the other joins the alliance. Apart from Jakku there's also some further hints towards the sequels, as the main character scouts D'qar, eventually the site of the Resistance base from TFA and the start of TLJ. (This was part of the "Journey to the force awakens" publishing initiative, which were mainly OT-era stories but which contained many hints about the upcoming movie).
There hasn't been any sequel I don't think that shows what happens to the characters later on, although the novel does leave a little bit of hope.