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Zack is burdened with a lovable grandfather who is considered a bit of a crackpot, more dreamer than is practical, and given to unexplained disappearances. Zack and his plucky friend Angelina decide to follow Grandfather one day and find out where he disappears to. What they find out is beyond what they could have imagined. Grandfather turns out to be quite a genius, although a loveably eccentric one. Who occasionally brought to my mind vague remembrances of Commander Caractacus Pott and Willy Wonka. Zack's grandfather has actually built a space ship, which he plans to take to the moon to establish a base there. Zack and Angelina stow away, and the adventure begins.

One of my favorite parts was the series of puzzles that are part of Grandfather's security system that Zack and Angelina have to solve in order to follow him. It was quite a bit of fun to experience with Zack and Angelina.

I truly enjoyed this story. The main characters are believable and likeable. I think both boys and girls will enjoy this one, particularly those who like stories about space, adventures and fighting against bad guys.