This needs to be read before Star Trek: Picard (the new TV series), or at any time after you begin watching it and wonder what happened to Picard that lead him to becoming an Admiral and then leaving Star Fleet.
This is a very well written story covering everything we need to know to more enjoy the series including how Picard met Raffi and their history; when and why Raffi started hitting the booze; Picard’s history with Elnor; the Romulan exodus, supernova and Picard’s part in it; the synth rebellion on Mars including Bruce Maddox and Agnes’ history; and many other things besides.
There are a few glaring omissions in this book: it becomes very clear that the Romulan sun did not go bang naturally, that there was something nefarious going on which was deliberately covered up by the Tal Shiar. I can only imagine one reason for not exploring this further in this book and that is because it will be dealt with in further seasons of the TV show — or another Una book? Whichever it is it certainly has the potential to stir up a huge bowl of gagh for our future Trekkie entertainment cravings.
So yeah, a must for all Trekkies.