A thrilling tale about five good-hearted kids thrust into an incredible adventure in a lost world haunted by dangerous creatures from Norse mythology. With mystery, suspense, and a whole lot of laughs, this action-packed page-turner will have readers 8 and up racing toward the end. Cade wants to be a professional baseball player. Garrett prefers football. Raegan loves to read and draw. And Ryan . . . well Ryan loves to eat. Taylor Ann is the one who wants to be an explorer. Taylor Ann is the one who asked her father to take them on a voyage to find Sjór Borg, a long-lost Viking city that disappeared into the sea centuries ago. And where did that get them? Trapped hundreds of feet below the Earth in some crazy underground world. Their parents told them they were not old enough to be explorers. They should have said that to the quicksand that swallowed them up while they were waiting for the boat. Now they have no choice but to prove their parents wrong. They'll have to draw on their wits, their courage, and each other to make it out alive. But it won't be easy. They'll have to escape a maze of tunnels, a volcano, a river made of wolf drool, and all kinds of mysterious mythological beasts! And if the kids thought all that was bad, it's nothing compared to what was coming next…