Children come to visit a little girl who lives all alone inside a castle that is housed inside of a museum.

The fourth book in the New York Times bestselling series by Jessica Day George, where a dangerous wizard threatens to destroy Castle Glower for good . . .
Fridays at Castle Glower are about to get interesting! With newborn griffins hatching left and right, new Castle passageways to explore, and an out-of-the-blue wedding to plan, life is as exciting as ever for Celie, Lilah, and Rolf. But when the dangerous, ancient wizard Arkwright...

In the aftermath of the bloody plague, Princess Imogen and Nico Mott find their paths crossing as they journey into a world where fresh horrors lie in wait - and where they must work together to defeat the monsters coming for them both.

Sergeant Hamish Macbeth—Scotland's most quick-witted but unambitious policeman—returns in M.C. Beaton's new mystery in her New York Times bestselling series. From the author of the Agatha Raisin series.
When Police Sergeant Hamish Macbeth hears reports of a haunted castle near Drim, he assumes the eerie noises and lights reported by the villagers are just local teenagers going there to smoke pot or, worse, inject themselves with...

During a summer at their great-uncle and aunt's castle in northern England, eleven-year-old Madlyn and her younger brother, Rollo, attempt, with the help of several ghosts, to save the rare cattle that live on the grounds.

Dear Reader: How would you like to be eighteen and four times a widow? If you live with a curse, sometimes things like this happen. And so they did. We have two sets of heroes/heroines; one set is in the present (1278 A.D.) and the other set is, quite simply, sometime else. We have both over- and underlapping stories, a dynamite mystery, lovers underfoot (visit with Dienwald and Philippa from Earth Song) and mega-doses of magic and mayhem. Come back...

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.

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

A young earl’s future in a sprawling castle could be changed by a feral girl and a cunning servant in this acclaimed gothic fantasy trilogy’s second entry.
Titus Groan is seven years old, lord and heir to the crumbling castle Gormenghast. A gothic labyrinth of roofs and turrets, cloisters and corridors, stairwells and dungeons, it is also the cobwebbed kingdom of Byzantine government and age-old rituals, a world primed

...

After discovering a giant egg in the magical Castle Glower, Princess Celie agrees to care for the egg and what creature it hatches.