In the cold & foggy Christmas holidays it doesnt seem as though the Five Find-Outers & Dog will have anything exciting to investigate. Fattys got some wonderful new disguises but there doesnt seem to be any mystery for them at all this time. Then Pip stumbles on a single furnished room in an otherwise deserted house. They try to find out whom the house belongs to but theyre not making much progress
- until Fatty decides to go to the house to see what he can uncover. Suddenly trapped by the men inside he writes a note to his friends apparently innocuous enough but with another secret message hidden beneath it. Mr Goon has tried investigating the house too but only ends up locked in the coal cellar & covered in dust. The rest of the Find-Outers call Inspector Jenks to help Fatty & find the house has been a place for storing stolen goods & the men inside are wanted criminals. Another mystery safely solved!