Artifacts of her life include a gold brooch she bought for her daughter, her prayer book and a portrait of her painted by Isaac Israels. The exhibit ends with a wall of posters from books and films that have focused on her life, including films in which she was played by Greta Garbo and Marlene Dietrich. Femme fatale, fallen woman, brazen double agent — every generation has its own version of Mata Hari. Today, Mr. Groeneweg said, there is a “bigger, broader picture” of the woman known as Mata Hari. “We are trying to focus on more aspects of her life than only her dancing career or whether she was a spy,” he said. “When you focus on Margaretha as a mother or a spouse, you can relate to more aspects of her life.” But the documents from the French archives have not filled in all of the gaps, Mr. Groeneweg said. “In some way, perhaps we have to be glad not knowing the complete story,” he added. “Something of the myth has to be preserved.”