Adrian replied; "There are three odds and ends what the book could be, besides lame love letter diary. Cannot tell which one without examining the book. One may be related to somekind Nether Scroll and some mad mage likely blew up their mansion going after it, one related to the family went playing demonlogist and summoning balor which likely blew up the mansion and it being his diary which is enchanted not to never burned or get rid of. Or lastly bloodline records which would prove family's royal degreed claim on Tethyr's or Cormyr's throne."