Book 1 Hub: https://www.bungie.net/en/Forum/Post/67742926/0/0
Book 2 Chapter 1: https://www.bungie.net/en/Forum/Post/149411074/0/0
Book 2 Chapter 2: https://www.bungie.net/en/Forum/Post/149586544/0/0
Book 2 Chapter 3 (END): https://www.bungie.net/en/Forum/Post/149779255/0/0