Detailed text transcripts for TV channel - CNN - 20180618:22:57:00
Much to stomach. so therefore, i decided that this is not for me. >> reporter: he spent nearly eight years working as a spy against al qaeda, undercover, deep inside the group, on behalf of british intelligence. in fact, dean isn't even his real name. it's a cover to protect his identity. his life as a spy inside the terror group is the subject of a new book, nine lives. >> arguably the most important western spy inside al qaeda. his intelligence was priceless. his identity, one of the most closely guarded secrets in the history of british espionage. >> reporter: one of the book's key revelati...
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