Mystery of the Spiteful Letters
Enid Blyton
Pip and Bets’ housemaid receives a spiteful letter in the post. Then Mrs Moon receives one too. Who would want to make them so miserable? By piecing together the clues, the Find-Outers are determined to find the culprit.
Reviews

I loved the bit in the story when Mr Goon dumped a whole lot of clues at the find outers feet.
Lady Fandango Scratchings 20.09.2023