Charles Wallace befriends a strange group of women living nearby - Mrs. Whatsit, Mrs. Who, and Mrs. Which. These three ladies soon take the children on a strange journey, promising to help them find and rescue their father who has been missing for two years. One afternoon, after meeting Calvin near the ladies' house, the three are swept off to another planet, Uriel, through the process of the tesser - the process of wrinkling space and time.