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Mrs Challenger is a non-canonical character created for the 2010 ITV adaptation of the short story The Blue Geranium. She is mentioned by Miss Marple. When Mrs Challenger died her knitting basket was full of discarded, unfinished, projects. They were so tangled up, that they couldn’t be untangled. Miss Marple felt that the case of the death of Mary Pritchard was just like that.

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