When strange and seemingly unrelated events start to happen and a precious Vermeer painting disappears, eleven-year-olds Petra and Calder combine their talents to solve an international art scandal. First book in the series featuring art sleuth friends Calder and Petra.
In the midst of a series of unexplained accidents and mysterious coincidences, sixth-graders Calder, Petra, and Tommy lead their classmates in an attempt to keep Frank Lloyd Wright's famous Robie House from being demolished.
When thirteen high-value pieces of art are stolen from a secret museum, Calder, Petra, and Tommy are grouped with two new companions to solve puzzles that are complicated by the clever Mrs. Sharpe.
When seventh-grader Calder Pillay disappears from a remote English village-- along with an Alexander Calder sculpture to which he has felt strangely drawn-- his friends Petra and Tommy fly from Chicago to help his father find him.
