A strange metal cylinder. A three-foot-tall bug-man. A dangerous world beneath the earth. Eleven-year-old Harper Graybridge never expects that one junkyard discovery will launch him into an underground realm filled with bizarre creatures, ancient ruins, and secrets powerful enough to change his life forever. When Harper meets Lyt—an insectoid traveler searching for the mysterious “keeper”—he’s offered the adventure he’s always dreamed of in the subterranean world of Murkmor. But Murkmor is far from safe. Poisonous jelly-monkeys stalk the forest, giant worms double as underground slides, and an evil overlord named Baron Vyndot believes Harper’s discovery is the key to unlocking a long-forgotten legend. With the help of Lyt and a fierce bird-warrior named Crowll, Harper must navigate deadly tunnels, crumbling ruins, strange new allies, and a villain determined to control Murkmor’s most dangerous secrets. Courage, friendship, and quick thinking may be the only things that can get him back home—alive. Perfect for readers who love: imaginative underground fantasy worlds - creature-filled adventures - fast-paced, page-turning action - friendships forged under impossible circumstances - middle grade heroes facing danger with heart Awards Gold Medal Winner – Readers' Favorite Awards 2025 - First Place – The BookFest Spring 2025 - Finalist – Colorado Authors' League 2025 - Finalist – National Indie Excellence Awards 2025 - Winner – Best Indie Book Awards 2025 Keeper of the Gremkat Key is a wildly imaginative, creature-packed middle-grade fantasy perfect for fans of adventure, humor, mythic worlds, and unforgettable heroes. Begin the adventure. Discover Murkmor. "A charming, exciting, and entertaining adventure, Keeper of the Gremkat will appeal to all ages with strange, humorous, and dangerous obstacles that a young hero must face.." — Liz Konkel, Readers' Favorite Reviews "The authors have crafted a richly detailed and imaginative underground world in Murkmor, filled with whimsical and frightening creatures that are certain to intrigue and entertain their young readership. Their ability to transport readers into this vibrant realm showcases their highly original creativity and establishes a captivating backdrop for Harper's adventure." — K.C. Finn, Readers' Favorite Reviews "Fans of fantasy adventures, myths, and legends will not want to miss out on this thrilling exploit filled with mysticism, friendship, and danger." — P. Rosenthal, Readers' Favorite Reviews Finding a weird metal cylinder in the junkyard—that's where it all started for eleven-year-old Harper Graybridge. The young explorer had no idea his discovery would lead to an encounter with a three-foot-tall bug-man named Lyt. When Lyt reveals he is searching for the very same cylinder—known to him as a keeper—Harper realizes his discovery is the key to an adventure of a lifetime. A bargain is made, and Lyt agrees to be Harper's guide into his world, the underground realm of Murkmor. It doesn't take long for Harper to find out Murkmor is as scary as it is wondrous. Running from poisonous jelly-monkeys, navigating treacherous ruins, and sliding down the inside of a giant worm are just a few obstacles Harper must overcome. Thankfully, Crowll, a bird-like warrior, has pledged to protect Harper on his journey. Harper, Lyt, and Crowll attempt to avoid danger and keep a low profile. Unfortunately, word of Harper's appearance reaches Baron Vyndot, an evil overlord who believes the keeper is vital to uncovering a long-forgotten legend. With a lot of courage, some quick thinking, and the help of some bizarre new friends, Harper may be able to survive and escape this crazy underground world. Returning home to his family will be complicated—returning home unscathed will be impossible.