What significant event occurs at the beginning of the book that drastically changes the Greystone children's lives?
What were the names of the three Greystone children?
What unusual item do the children find that leads them to suspect their mother's disappearance is connected to the news report about the kidnapped children?
Who is the woman who comes to stay with the Greystone children after their mother disappears?
What does the oldest Greystone child, Chess, initially decide to do with the cryptic clues their mother left behind?
What is the name of the place their mother repeatedly warns them not to go?
What unique characteristic do the kidnapped children in the news report share with the Greystone children's own mother?
What is the primary danger associated with the place the children must go to find their mother?
The codes, riddles, and instructions left by their mother are primarily intended to help the children do what?
The conclusion of the book reveals that the three kidnapped children are actually...