One of my players too Blood of the Pharaohs and really wanted that to mean something and he really like RP opportunities, so really wanted something to come of this idea.
His character is a paladin of Sarenrae and backstory was that she was a member of the Precinct of the Left Eyes before the Lottery and her service was up. Right around that time I had some homebrew story about bandits on the trade route from Katapesh as a way to bring the players together before the Lottery. Anyway, the other piece of information about his character was that the character lived in Wati with her grandmother who was always going on about her being meant for more and the character just thinking she's an old coot.
So for the auction at the beginning of Book 2, I had a lot that included some census records dating back to before the Plague of Madness and something about the records sparked something that his character (Persephone) remembered her grandmother saying, so she purchased the records from the auction. When she checked on her grandmother during Book 2, she gave her the records. At the end of Book 2, I had her grandmother unveil the 'family secret'. She explains thus:
Persephone is descended from a family that was cousins to the pharaoh a long time ago. They were made governor of Wati and the city prospered under their administration. However, when the Plague of Madness hit Wati, another greedy noble family betrayed Persephone's family and made the citizens believe that Persephone's family was the cause of the Plague of Madness. In their fear, and because of the Plague, the citizens turned on Persephone's family. Before they were slaughtered, they had the handmaid for their youngest heir flee with their child. They escaped to Tephu and, fearing for the safety of the child, hid their identify. The handmaid raised the child as her own, revealing the secret only when near death. Each generation, the descendants of the handmaid protect the descendants of the heir to the family in hopes of one day restoring the family.
With the census records from before the Plague of Madness, Persephone had one piece of the puzzle to restoring her family. Her grandmother provided her with a signet ring with her family's crest and suggested that further research in the Great Library in Tephu could reveal more. This allowed me to let his character make her own research checks regarding her family history while the rest of the group worked on research checks in Book 3 Part 1. Additionally, I'd said that the original handmaid left evidence with the priests at the Houses of Order and Wisdom. Between these, it provided his character with a 'mini-quest' to work on while the rest of the group was doing research.
I haven't worked out all the finer points, but ultimately by the end of the AP the intention is to have collected enough evidence to proves that A) Persephone is descended from the family that was governor at the time of the Plague of Madness and B) was betrayed and lands stolen by this other family (unnamed) which are still a wealthy/noble family in Wati. All evidence collected would result in the close of the AP his character restoring the family name and acquiring a potion of the lands/wealth of the family that wronged her ancestors.
