If the previous book managed to make what was likely close to the most from the limited source material, the short length being justified by the need to avoid overstaying its welcome, now I must say that I’d have liked to read the book The Destiny Knight could have been if it’d have fully exploited the source material provided by the game. Don’t get me wrong, it’s better than the first one if you judge it according to the same criteria, actually making it far less obvious that it’s based on a game at all, again doing well to avoid losing itself in endless battles, twisty dungeons and confining corridors, and not only remaining quite engaging but largely even offering some worldbuilding. However, it’s the difference between what it is and what it could have been, the existing potential, that’s much greater.
Considering how much it focused on the puzzles, I think it could have even done with a few more battles, and battles which the party actually won in particular, since many of those presented are a matter of them holding the enemies off long enough to either escape or solve a puzzle. But the main problem I had was that there were several locations that could have been exploited much better, resulting in much more worldbuilding, at least a few more secondary characters and the general feeling that it’s a proper book, set in an actual fantasy world, and not just a novelization of an adventure. And no, Isobel didn’t redeem herself in my eyes; I doubt one like her ever could.