Chapter 5 Summary

Meg learns that her father is behind the black cloud, and that he can't escape on his own. But the witches are sure that, with Meg, Charles Wallace and Calvin's help, Mr. Murry can be freed. Mrs. Which readies them for another journey, but the children want an explanation of how they are traveling.

Mrs. Who tries to explain a tesseract as a line that is brought together to shorten the distance. Meg still doesn't understand, so Charles Wallace tries to explain it through math. A tesseract is the fifth dimension, which takes time and squares it with space. Meg and Calvin understand enough to go on to the next place.

The next planet they visit is in Orion's belt and is the home of the Happy Medium. Mrs. Whatsit, Mrs. Who and Mrs. Which have brought the children to her so that...