'Look! There's a light ahead! That's the thief! Come on, we'll soon get him!'

It's the holidays, and whilst George can't seem to keep herself out of trouble, the others are busy looking for it! When they discover a mysterious clue at the farmhouse, they can't wait to solve it.

But then Uncle Quentin's secret papers go missing at Kirrin Cottage and a treasure hunt turns into a hunt for the thief. Can the Famous Five outwit their dangerous enemies and catch the criminals?