(Thirst#5) The Sacred Veil by Christopher Pike

It's no dream.
At last the truth of what happened during those hellish days has come back to her.

In her five thousand years as a vampire, Alisa - or Sita, as she was originally called - has experienced the equivalent of fifty lifetimes. Every moment of her immortal life is seared deep into her being. Every person she has loved, every victim she has killed - their faces are forever part of her.

Yet, strangely, a handful of memories have been lost to Alisa. As she and her friends embark on a search for the location of a sacred artifact - an ancient veil that may hold the key to mankind's salvation - Alisa soon realizes that her own mind may be her greatest enemy.

The memories she is blocking deal with the most horrifying period in mankind's history, a time when she was tortured by a madman responsible for the deaths of millions. But what information did her torture yield?