A Wind in the Door by Madeleine L'Engle is the sequel to A Wrinkle in Time. In this story there is an evil that is wreaking havoc on both a cosmic and a microscopic level. On the cosmic level stars seem to be disappearing and on the microscopic level people are getting sick with a strange disease affecting the mitochondria in their cells which causes fatigue and respiratory distress. Charles Wallace has come down come down with this condition. His sister Meg and her friend Calvin are called upon by some strange extra-terrestrials to help both save his life and to help fight the evil running rampant throughout the universe.
Like A Wrinkle in Time, this story has both elements of science fiction and fantasy. It also has some strong spiritual themes, but I feel that they are less religion specific than they were in the last book, so it bugs me less. This book is one of my childhood favorites, and as anyone who has read the book can see, it is very special to me considering that I took my screen name from one of the concepts described in the book. It was very strange reading the book again after all these years because my screen name feels very much a part of me and it was so odd seeing it constantly in a book despite the fact that this book is where it came from. Other than that, I really did enjoy reading it again very much and I would highly recommend it to others of all ages.