A Wrinkle in Time

Thirteen-year-old Meg Murry struggles to adjust to school and home life ever since her father Alex, a well-renowned scientist, mysteriously disappeared while he was studying astrophysics. Both Meg and her mother Kate believe he solved the question of humanity's existence and theorize he was teleported to another world.

During the night, Meg's younger brother Charles Wallace welcomes a stranger in a large white dress named Mrs. Whatsit into the Murry family house. She mentions the tesseract, a type of space-travel Alex was working on, is real, and leaves soon after. The next day, one of Meg's classmates, Calvin O'Keefe, joins them to go to the house of Mrs. Who, another strange woman who only speaks in quotes and seems to know Charles Wallace. Read more on Wikipedia.