Meg from the "Wrinkle In Time" was very sad that her dad disappeared.
Meg, her friend Calvin, and her brother Charles Wallace, went to one of the witches houses and her name was Ms. who.
When they arrive back to Meg's and Charles house, they eventually meet the rest of the witches, Ms. Which and Ms.Whatsit. The three witches tells the children that there father is trapped by darkness in the universe. So, the witches tesseracts everyone and they go to another planet to see if Meg and Charles father is there.