Discover your inner superhero in the further adventures of the intrepid SUPERQUESTERS! When Lilli, Bea and Leo need inspiration for how to clean up their local river, they journey to Questland to research ideas for a machine to clear up the rubbish. The trio discover the sea is in a state of fury and unrest and only they can help. Lord Grumble has teamed up with Captain Blackwaters on a terrifying tanker. They are tearing through the waters of Questland, leaking oil and littering, polluting the watery habitat and marine life. The SuperQuesters set out to stop the dastardly duo, clean up the waters of Questland and rescue the marine life. Lilli, Bea and Leo – and the reader – must use their STEM skills to save otters from an oil spill, rescue a narwhal and stop the pirate robots.