This was such a great book I couldn't put it down! I loved this book because a lot of the things that the author clearly made up seemed completely real when the concepts were explained. One of them was the concept of a tesserect being a fifth dimension of travel where a straight line is not the shortest distance between two points. I feel like the idea of a tesserect or a wrinkle in time was actually real when I was reading the book. The book is a little old but it still seems like any teen today would really enjoy the book because I enjoyed it so much. If you like young science fiction novels you will probably like this book.