From publisher blurb:
A Pathfinder Society Scenario designed for levels 3–7.
When a samsaran dies, he is reborn again with few memories of his past lives. The cycle continues until he has earned a righteous place in the afterlife. After years of service and lifetimes of accomplishment, Venture-Captain Bakten nears the end of his noble existence and has begun investigating his past lives as a means of understanding Tian Xia's rich history. However, he cannot complete his research alone, and only with the PCs' assistance can they decipher the region's past.
"The Lost Legacy" is the first scenario in the two-part To Judge a Soul campaign arc. It is followed by [Pathfinder Society Scenario #7-08: To Judge a Soul, Part 2: Karma Reclaimed] and is intended to be played in order.