Finish the following levels to get
the book indicated:
Attack at Cedarleaf - Unlock Book;
Zhai's Past
The Wizard's Tower - Unlock Book; Khelben's Letter
The Jungles of Chult - Unlock Book; Illius' Youth
The Yuan-Ti Temple - Unlock Book; Nesme's Fall
Stand at Mithral Hall - Unlock Book; Cireka's Vow Drizzt's Journal
Into the Underdark - Unlock Book; Ygorl And The Dragon