It Started With A Book...
... a memoir of Glenn L. Carle, the CIA case officer in charge of the interrogation.
... a very interesting read.
But after reading it, I grew restless...
I wanted to discover a bit more than I was allowed to, due to the CIA having heavily redacted the manuscript. I wanted to know who "CAPTUS" was and whether he was guilty or innocent. I wanted to know the locations of the secret interrogation centres.
So I went to the internet and eventually obtained some satisfaction.
Cutting through the crap of the CIA's ridiculous and pointless redactions:
"CAPTUS" was a Hawala banker named Pacha Wazir. He was, by and large, an innocent bystander in the bigger game played by al Qaeda.
The intitial CIA interrogation was probably conducted in a compound run by the Moroccan Secret Service near Rabat (in Morocco.)
"Hotel California" was a "black site", known for the use of torture, probably the one known by the CIA codename "Salt Pit", located a short distance north of Kabul, Afghanistan.
 Truth Out: CIA Kidnapped, Tortured "the Wrong Guy"
 Harper's Magazine: Unredacting “The Interrogator”
 Harper's Magazine: "The Interrogator": Six Questions for Glenn Carle
 Wikipedia: "Salt Pit"