Directly below was a sight none of them had ever seen before - a kind of spiral, with glowing ruby-red lights that curved outwards like tentacles.In the middle was a dark circle, inky black. It had the look of a really, really deep well.Ursula and her friends are in a race against time. The Collector has taken Stella captive, and is hungrily snatching up all the beautiful places of the world in her snow globe prisons. She needs to be stopped, but first they must find her.To aid them in their quest, the explorers seek help from new allies, including a Pirate Queen, with a ghost ship that can defy time and space, and then take to the skies in a galaxy fairy rocket. But their journey is fraught with danger, as the future of the planet hangs in the balance.Escape into a sensational world filled with space moles, sea goblins and giant sharks, all covered with a sprinkling of moon dust!

Alex Bell has published novels and short stories for both adults and young adults including Frozen Charlotte, a Zoella Book Club pick. The Polar Bear Explorers' Club was her first foray into middle grade. She always wanted to be a writer but had several back-up plans. After training as a lawyer, she now works at the Citizens Advice Bureau. Most of her spare time consists of catering to the whims of her Siamese cat.Tomislav Tomic graduated from the Academy of Fine Arts in Zagreb. He started to publish his illustrations during his college days. He has illustrated a great number of children's books. He lives and works in Zapresic, Croatia.