From the trivia section of the IMDB page: The title changed to "Seven Sisters" during post-production but when Netflix bought the film, it was changed back to "What Happened to Monday", its original title. It's called Seven Sisters in a few other countries as well. June 23, 2023. Courtesy of Netflix. In 2015, nine-year-old Maya Kowalski developed an illness that immobilized her and left her in excruciating pain. The new Netflix documentary Take Care of Maya .

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