Grade 58Those precocious art sleuths Calder, Petra, and Tommy are back, and this mystery is every bit as intricate, engaging, and delightful asChasing Vermeer (2004) andThe Wright 3 (2006, both Scholastic). The three seventh graders go with their class to an exhibit of Alexander Calder's mobiles at the Museum of Contemporary Art in Chicago. Soon after, Calder and his father travel to a remote village in England that has an anonymously donated Calder sculpture, theMinotaur, and a maze at Blenheim Park. Both the boy and the sculpture disappear on the same night. Balliett's love of words and her ability to tuck hidden, subtle clues into her story are evident throughout. Petra and Tommy fly to England to help Calder's dad and the police find their friend. The kids see mobiles everywhere: in the leaves, flying crows, paper trash. Indeed, the whole story is structured as a mobile, with plot and characters twisting and turning, moving and dancing around each other. The young sleuths are able to take what seems to be chance and coincidence and apply their own conclusions to the puzzle wrapped inside this mystery. Balliett's wonderful writing is full of foreshadowing, literary allusions, wordplay, and figurative language. Calder's signature yellow pentominoes play an important role, and the kids create a new code. Helquist's detailed illustrations enhance this multilayered story. Fans of the author's previous novels are in for a treat in this latest adventure.