Check out the first chapter of WRATH OF A MAD GOD by Raymond Feist!
CHAPTER 1: ESCAPE
The searing agony that seized her mind relented for the briefest moment, and in that instant she found what she had been seeking. The preponderance of her awareness was occupied with the battle of wills with her captors, but a tiny fragment—a disciplined fraction of her consciousness—had been readied. Over the days of interrogation and examination she had used every respite to partition off this one sliver of her intellect, to somehow overcome the blinding pain, and observe. During the last four encounters with the Dasati Death-priests she had achieved that detachment and willed her body to withstand the pain. It was there, she knew, in-flamed nerves protesting about the alien energies coursing across the surface of her mind, probing it, seeking insights into her very being, but she had learned to ignore physical pain centuries before. The mental assaults were more difficult, for they attacked the root of her power, the unique intelligence that made her a supreme magician on her home world.
These Dasati clerics lacked any pretense of subtlety. At first they had ripped open her thoughts like a bear pulling apart a tree stump looking for honey. A lesser mind would have been savaged beyond recovery on the first assault. After the third such onslaught, Miranda nearly had been reduced to idiocy. Still, she had fought back, and knowing there was no victory if there was
no survival, she had focused all her considerable talents first on endurance, then insight.
Her ability to shunt aside the terrible assault and focus on that tiny sliver of knowledge she had gained kept her sane. Her determination to overcome her captivity and return with that knowledge gave her purpose.
Now she feigned unconsciousness, a new ploy in her struggle with her captors. Unless they possessed finer skills than she had so far encountered, her charade was undetected: to them she appeared incapacitated. This counterfeit lack of awareness was her first successful conjuration since her captivity began. She risked just enough body awareness to ensure that her breathing was slow and shallow, even though she suspected the Deathpriests who studied her still knew too little about humans to understand what physical signs to observe. No, her struggle was in the mind, and there she would eventually triumph. She had learned more about her captors than they had about her, she was certain.