A Third Mystery For Thirteen-year-old Agatha Oddly - A Bold, Determined Heroine, And The Star Of This Stylish New Detective Series. As The Youngest And Newest Recruit To The Gatekeeper's Guild, Agatha Oddlow Know She's Got A Lot To Prove - Not Least Because Her Mother Was Such An Important Member Of The Secret Society. So, When An Assistant At The National Gallery Goes Missing, Agatha Begins Investigating. Soon She Uncovers A Plot Bigger Than She Could Ever Have Imagined. As Agatha Delves Deeper And Deeper Into The Mystery, She's Not Sure She'll Ever Get To The Bottom Of It All...