Mr. X

Mr. X is the name used in government investigative accounts for a masked interrogator who took part in the special interrogation plan for Mohamedou Ould Slahi at Guantánamo. In Slahi’s account, the figure’s overnight sessions formed one part of an organized effort to keep him awake and pressure him to cooperate. Later government reviews corroborated important features of the treatment, while the interrogator’s covered face and the censored record leave his personal identity unresolved in the available account.

Identity and Place in the Interrogation Team

The label Mr. X does not identify the interrogator by personal name. An editorial note explains that military, Justice Department, and Senate Armed Services Committee reports use it for the third of four interrogators who carried out Slahi’s Special Interrogation Plan. At a 2005 administrative review hearing, Slahi described the man as covered except for openings for his eyes and wearing gloves. The disguise made concealment part of the encounter: Slahi could describe the interrogator’s appearance and conduct, but not see his face.

The book’s account places Mr. X within a larger, secretive task force formed because interrogators were repeatedly reporting that they had collected no information. Slahi describes a team whose work included keeping detainees awake and using music, darkness, and restrictions on Islamic practice. The text does not establish Mr. X’s personal motives or disclose his name. It does show how the masked figure functioned within a coordinated system rather than as an isolated presence.

Overnight Sessions and Methods

Slahi says that Mr. X deprived him of sleep for about two months. The methods he lists include lowering the room temperature, requiring him to write about his life, repeatedly giving him water, and making him stand for extended periods. He also recounts being subjected to degrading treatment and placed in a cold room containing U.S. propaganda images, including a picture of George W. Bush, while the National Anthem was played repeatedly. Taken together, these details describe an effort to control the conditions of Slahi’s waking hours as well as the subjects and symbols imposed on him.

Other sessions, as Slahi describes them, involved a dark room, images intended to represent devils, and music played for much of the night. He says that Mr. X prohibited Islamic practices, including prayer and recitation of the Quran. The account therefore presents religious restriction not as incidental to the interrogation but as part of the surrounding regime: while Slahi was being kept awake, the practices that might have offered structure or consolation were also denied.

An editorial note identifies a July 8, 2003, session as apparently involving Mr. X. The Senate Armed Services Committee’s review records that Slahi was exposed that day to changing light patterns and rock music, including a song by Drowning Pool. The date and the documented session provide a specific point of comparison between Slahi’s account and the later official record. They do not, by themselves, verify every detail of every overnight encounter.

Escalation and Threats

Slahi describes a point at which the special team concluded that he would not cooperate as they wanted and a further level of mistreatment followed. In his account, masked personnel and another interrogator entered the room; Slahi was assaulted, forced to drink salt water, and then handed over to an Arabic-speaking team that continued the abuse. The episode marks a change in the course of the interrogation: pressure by the overnight team gave way to a transfer between interrogators, with the same goal of compelling cooperation. The account says Slahi was subsequently returned to his cell. The available text does not establish that Mr. X alone directed every part of this sequence.

Investigative records also describe threats attributed to a masked interrogator during the special interrogation period. One report recounts a threat framed through a dream of detainees being buried, presented as a warning that Slahi would remain at Guantánamo and die there if he did not talk. Other records describe threats that his family had been incarcerated and that he could disappear, with his existence effectively erased from official notice. These are reported tactics, not evidence that the threatened outcomes occurred. Their place in the record is significant because they show pressure extending beyond the interrogation room and directed toward Slahi’s family ties and fear of being lost from public view.

Corroboration, Consequences, and the Record

The narrator’s account of Mr. X is supported in part by records that became publicly available through official reviews and investigations. An investigator working with prosecutor Stuart Couch obtained access to military interrogation files, including daily memoranda that recorded both what was said and how information was extracted. The files themselves remained classified, but the Senate Armed Services Committee and Justice Department reviews summarized the special interrogation and its methods. Their accounts broadly matched Slahi’s description of the plan, while particular sessions and tactics received more specific documentation.

The evidence also indicates consequences beyond the individual sessions. Slahi says that doctors were not allowed to see him until around March 2004 and that he first received psychological assistance the following month. He later took medication to help with depression and sleep and received psychological assessments, though he says fear of retaliation prevented him from telling the clinicians the real reason for his condition. The book does not attribute each health consequence to Mr. X alone; it places the delayed treatment in the wider context of Slahi’s confinement and interrogation.

The account reaches readers through a manuscript marked by government redactions, as well as editorial annotations that compare its descriptions with public sources. The editor states that the notes do not attempt to reconstruct censored text or reveal classified information; they offer the most plausible public-record context where it matters to understanding the narrative, and explicitly allow that speculation may be mistaken. That distinction matters to Mr. X’s portrayal. The label, the reported conduct, and the corroborating records make the masked interrogator legible as part of the plan, but the gaps prevent the published account from turning that label into a fully known individual. His narrative role is consequently double: he is a recurring agent in Slahi’s description of the interrogation, and a figure whose concealment mirrors the secrecy of the system that made the interrogation possible.