Mildew and Sponge have plenty of complaints about Maudlin Towers, but the threat of its closure makes them realise how much worse being separated might be. A secret search for buried treasure offers a possible way to save the school.

Their investigation soon becomes tangled with a suspicious new boy, an unusual teacher and puzzles they did not expect. Written and illustrated by Chris Priestley, this second Maudlin Towers adventure combines a creepy setting with humour and mystery.