The mudlarkers of the Thames and Tide Club are about to face Squidmageddon in a funny and fast-paced adventure for young treasure hunters. When the director of the mudlarking museum goes on holiday for a week, he leaves three members of the Thames and Tide Club - Clem, Zara and Ash - in charge. They're determined that nothing will go wrong on their watch, but they haven't planned on an invasion of squid who will stop at nothing to take over the world ... Join the club and dig for treasure in the wildest adventure you could imagine!