The book is a fantasy story set in South Korea. It involves a young boy (Minsu) and a young girl (Jimin) who visit some Buddhist monks to help them deal with the loss of their cat Oonky. After a close call with death Jimin awakens an ancient warrior from the time when Korea was divided into three kingdoms who asks the children to do a favor for him. In the process the children meet the matriarch of the Turquoise Palace of Korea Past and Present Ms... While at the palace the children have the opportunity to observe some great moments in Korean history made by the people who did it. After the favor is fulfilled the children return to modern Korea.