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Sister Dolores is a non-canonical character created for ITV's 2005 adaptation of The Mystery of the Blue Train. She is the wife of Rufus Van Aldin who has been committed to a convent located in or near Nice.

According to Van Aldin, Dolores had become mentally unbalanced. She tried to leave Van Aldin while smuggling the baby Ruth Kettering in a suitcase and almost killed her in the process. Van Aldin tells Poirot that Dolores is not unhappy in the convent--she is after all not an inmate but "management".

It is possible that Ruth was on the way to Nice in the Blue Train in order to look for and meet Dolores. Poirot found a piece of paper in Ruth's compartment which was the latter half of a letter from Sister Rosalie to Van Aldin which appears to be discussing arrangements for the reception/care of Dolores.

When Poirot meets Dolores, she tells him that Ruth had come to visit her and showed him the flowers she had brought. But this was not possible as Ruth had been murdered before she arrived at Nice. Poirot later discovers that the woman who visited Dolores was in fact Mirelle. In this adaptation she is Van Aldin's lover. She had gone to Ruth's compartment and had taken the top half of the letter and decided to go and see Dolores. She told Poirot she wanted to know what her fate would be if she ever married Van Aldin. Dolores, in her deluded mind, thought Mirelle was Ruth.

Sister Dolores is portrayed by Etela Pardo.

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