Excerpt
"When are we going home?" Meg asked anxiously. "What about Mother? What about the twins? They'll be terribly worried about us. When we didn't come in at bedtime--well, Mother must be frantic by now. She and the twins and Fort will have been looking and looking for us, and or course we aren't there to be found!"
"Now, don't worry, my pet," Mrs. Whatsit said cheerfully. "We took care of that before we left. Your mother has had enough to worry her with you and Charles to cope with, and not knowing about your father, without our adding to her anxieties. We took a time wrinkle as well as a space wrinkle. It's very easy to do if you just know how."
From the Paperback edition.