Meg's father mysteriously disappears after experimenting with the fifth dimension of time travel. Determined to rescue him, Meg and her friends must outwit the forces of evil on a heart-stopping journey through space and time. A commemorative edition with an Introduction by the author. A Newbery Medal winner. アメリカ人作家、マデレイン・レングル1962年初版の児童文学。累計1,000万部以上の記録的ベストセラー。時間と空間をテーマとし、SF風味も効いた冒険物語のジュブナイル小説。