Tuesdays at Castle Glower are Princess Celie's favorite days. That's because on Tuesdays the castle adds a new room, a turret, or sometimes even an entire wing. No one ever knows what the castle will do next, and no one--other than Celie, that is--takes the time to map out the new additions.

Count Harken is back to take his revenge on the Red King's heirs, starting with Charlie Bone's family! Charlie's ancestor has been kidnapped and imprisoned in the dark, forbidding land of Badlock, and it's up to Charlie to save him. Traveling through a painting to the terrifying countryside, Charlie and his best friend's dog, Runner Bean, take up the quest.

While visiting an old castle in England, Samantha and Nellie solve mysteries involving a ghost and some missing rare books. Includes end note about England in the early twentieth century.

While spending the summer with elderly relatives at Clawstone Castle in northern England, Madlyn and her brother Rollo, with the help of several ghosts, attempt to save the rare cattle that live on the castle grounds.

Charlie faces his most dangerous adventure yet when the shadow from the Red King's portrait escpes. Strange things start to happen at Bloor's Academy. A mysterious force, however, is helping Charlie get closer to the truth about his father.

Eric and his friends learn that Zorfendorf Castle holds a secret which they must prevent from falling into the hands of Emperor Ko. There's only one passage between the Upper World and Droon, the magical rainbow staircase. At least, that's what Eric and his friends have always believed. But now Ko and his beasts are attacking Zorfendorf Castle, a magical fortress that's hiding a huge secret: the Fifth River, another passage to the Upper World. Ko...

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

The Alden children have another mystery to solve when they visit a castle and must figure out which of the guests has stolen the Stradivarius violin.