A third mystery for thirteen-year-old Agatha Oddly - a bold, determined heroine, and the star of this stylish new detective series. n n n Agatha Oddlow is on the case with yet another adventure! An assistant at the National Gallery has gone missing, but when Agatha begins investigating, she uncovers a plot bigger than she could ever have imagined. Join Agatha as she travels throughout London and into the very heart of the mystery... n