From the critics
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joycemas thinks this title is suitable for between the ages of 8 and 12
Orange_Cat_155 thinks this title is suitable for 11 years and over
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When a book of unexplainable occurences brings Petra and Calder together, strange things start to happen: Seemingly unrelated events connect; an eccentric old woman seeks their company; an invaluable Vermeer painting disappears. Before they know it, the two find themselves at the center of an international art scandal, where no one is spared from suspicion. As Petra and Calder are drawn clue by clue into a mysterious labyrinth, they must draw on their powers of intuition, their problem solving skills, and their knowledge of Vermeer. Can they decipher a crime that has stumped even the FBI?
Calder and Petra are 6th graders in Chicago. Petra loves words; Calder is more comfortable with math and puzzles (like the pentominoes he carries with him everywhere). Three anonymous letters, a mysterious book, and a stolen Vermeer painting make Calder and Petra join forces. They work together as clues and puzzles lead them further into the mystery. Readers are encouraged to work out the puzzles (decoding messages, math puzzles, etc.) along with Petra and Calder.
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