Madeleine L'Engle

Polly's visit to her grandparents in Connecticut becomes an extraordinary experience as she encounters old friends and mysterious stangers and finds herself traveling back in time to play a crucial role in a prehistoric confrontation. A quiet visit with her grandparents turns into a lesson in the fluidity of time for Polly O'Keefe when she meets several strangers from overlapping temporal planes and, with them, plays a key role in a prehistoric confrontation....