For years, I thought this was it, The Wallace Family trilogy. I read A Wrinkle in Time to my sixth graders every year during the 80s as I discovered it with them. Later, I read A Wind in the Door and reread it recently. I do not think I ever read A Swiftly Tilting Planet until now, as I began my Madeline L’Engle “project”–to read as much by and about her as I could. The first thing I assigned myself was to read this trilogy, only to discover that the characters in these three books were in two other books as well.
Time travel appeared in the first book (My students and I were all enthralled by the theory of the tesseract.), and the book became a classic. It made L’Engle the well-known writer and household name she is today. L’Engle’s granddaughters ended their biography of her with the publication of Wrinkle, establishing her as a writer and as they point out, L’Engle published her own autobiography, A Circle of Quiet, soon after.
Book two, Wind, deals with gene therapy and DNA particles, which was years ahead of its time.
Book three, Tilting Planet, also deals with time travel, but more of a regression into past lives, a “going within” and the concept of changing things for the better. All of this reflected L’Engle’s interest in and experimentation with past lives.
I have read these three and am as enchanted with the rereading as I was with them upon first reading. I highly recommend this series to readers of all ages.