Mimi, Papa, and their grandchildren, Christina and Grant are uber-excited to visit the famouse Neuschwanstein Castle in Bavaria, Germany!. They call it the "Crystal Castle." The excitement begins as soon as the Mystery Girl lands and Grant finds a map -- but where does it lead??? Follow the kids on their amazing adventure through cool underground caves, towering turrets, and the sights, sounds and tastes (yummm!) of Oktoberfest!

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.

Geronimo, Thea, and their cousin Trap explore an old castle built by Grant Gentlemouse, the founder of New Mouse City, and when they find one hundred keys and only ninety-nine doors inside, they set off in search of the missing room.

Charlie's new semester and a mysteriuos student seems to be magnetic and his friend Billy has been locked behind a force field in the passing house....but the mirrors change everhthing.

When Mandie and Celia left the United States to spend the summer traveling with Mrs. Taft through Europe, they didn't expect that each new place they visited would have a mystery and adventure all its own.

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

Magically-gifted Charlie Bone, accompanied by his best friend's dog, Runner Bean, comes to the rescue when the enchanter Count Harken takes revenge on the Red King's heirs by kidnapping and imprisoning Charlie's ancestors in the dark, forbidding land of Badlock.

It is years since King Timoken, his sister Zobayda, and his friends settled in the enchanted Red Castle, but now they are all threatened by the evil beyond the castle's protective spells and it will be up to two of Timoken's nine children, Petrello and Tolomeo, to find out which of their siblings is the traitor in their midst, and defeat their enemies.

"Twelve-year-old Olia knows a thing or two about secrets. Her parents are the caretakers of Castle Mila, a soaring palace with golden domes, lush gardens, and countless rooms. Literally countless rooms. There are rooms that appear and disappear, and rooms that have been hiding themselves for centuries. The only person who can access them is Olia. She has a special bond with the castle, and it seems to trust her with its secrets. But then a violent...