When Calder Pillay travels with his father to a remote village in England, he finds a mix of mazes and mystery — including an unexpected Alexander Calder sculpture in the town square. Both the boy and the sculpture seem to be out of place . . . and then, on the same night, both disappear! Petra and Tommy must fly to England and help Calder's father find him. But this mystery has more twists and turns than a Calder mobile caught in a fierce wind — with more at stake than first meets the eye.

Can you figure out what has happened faster than the others — while there is still time?