Polly, daughter of Meg Murry of A Wrinkle in Time, and neice of Sandy and Denys Murray of Many Waters, is spending time with her mother’s parents in New England. A neighbor, “Bishop Nase” manages to open a Time Gate which transports individuals back in time. Both the Star Gazing Stone and the Old Wall act as portals for Polly on several occasions. Meeting Anaral, a Druid who travels back and forth, and other characters from the time period, Polly and her cowardly friend Zak manage to become stuck 3,000 years before the present.
Back in time, Polly finds herself with The People of the Wind, and later captured by their enemies The People Across the Lake. They are besieged with drought and believe that a blood sacrifice is necessary to bring rain to their land and tribe.
Although the novel is not traditionally religious, it is spiritual and offers something for both believers and non-believers.