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To unlock it, Jack Harkness had Detective Kathy Swanson buy Emily Dickinson: The Complete Poems, and was prepared to go through every single poem in the book. After they tried at least "Success is Counted Sweetest" and "My Life Closed Twice Before Its Close", Toshiko Sato realised that the code wasn't another poem, but a series of numbers — the ISBN. (TV: They Keep Killing Suzie)