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322 pages, Kindle Edition
First published November 16, 2010
Four copies of it are dispatched to the U.K.’s nuclear submarine fleet. The sealed letter is to be locked inside a safe, which itself is locked inside a safe on the sub’s control room floor. Both safes and the letter were only to be opened during certain specified conditions that indicate a nuclear attack has cut the submarine off from home island guidance. The prime minister’s letter…is to tell the sub commander what he thought he should do with his nuclear weapons and under what circumstances he should fire them.