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In page Inspector Morse:

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Although details of Morse's education are deliberately kept vague, it is hinted that he won a scholarship to study at St John's College, Oxford.[1] He lost the scholarship as the result of poor academic performance stemming from a failed love affair, which is mentioned in the second episode of the third series, "The Last Enemy", and recounted in detail in the novel The Riddle of the Third Mile, Chapter 7. Further details are revealed piece-by-piece in the prequel series.