A Swiftly Tilting Planet (Time Quintet #3)
by Madeleine L'Engle
Middle grade · ages 10–14 · 810L (~5th grade) · 1979
Why we'd hand it over
Dense, ambitious, and genuinely strange — asks big questions about causality and moral choice, but the plot threads can feel scattered and the prose occasionally overwrought even for devoted L'Engle readers.