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!