When Jerry, Jimmy and Cathy discover a tunnel leading to a castle and a sleeping princess, astonishing things begin to happen.

While visiting Wallis's castle, Dink and his friends investigate strange noises that lead them to a dangerous secret.

Frank and Joe Hardy search a mysterious castle for clues to a stolen, extremely valuable comic book.

Eleven-year-old Princess Celie lives with her parents, the king and queen, and her brothers and sister at Castle Glower, which adds rooms or stairways or secret passageways most every Tuesday, and when the king and queen are ambushed while travelling, it is up to Celie--the castle's favorite--with her secret knowledge of its never-ending twists and turns, to protect their home and save their kingdom.

Charlie and his magically gifted friends and relatives work together to rescue Billy Raven, a young orphan, from a mysterious and dangerous couple who have adopted him.

Prince Lucas and his best friend Clara discover a ghost haunting Wrenly Castle.

Twelve-year-old William uses the magic token to return, through the toy castle in his attic, to the medieval land of Sir Simon, which is now menaced by a skeleton ship bearing a plague of ravenous rats.

While at a reportedly haunted castle in Maine with her father and the ghost-hunting crew for his podcast, skeptical Gabby debunks reports of a mysterious "lady in white," but when she hears a strange phone ringing, she discovers there are some things even she cannot explain. Includes chapter endnotes with background information, a glossary, discussion questions, and writing prompts.

Uncle Samuel S. Stingysnout invites the whole Stilton family to creepy, faraway Penny Pincher Castle for a big surprise

"Castle Glower's towers have transported Princess Celie, her siblings, and her pet griffin, Rufus, to an unknown land. As they set out on a dangerous adventure to discover their whereabouts, they find an entire lost people, divided by the wishes of two wizards in a centuries-old quarrel over their beloved home--Castle Glower"--