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. See how they get on in The Mystery of the Spiteful Letters. The Mystery series follows the adventures of ‘The Five Find Outers’ – Pip, Bets, Larry, Daisy and Fatty, as they solve the most unusual crime cases with the help of their dog Buster.