"When her mom inherits an old, crumbling mansion, Seda's almost excited to spend the summer there. The grounds are beautiful, and it's fun to explore the sprawling house with its creepy rooms and secret passages. Except now her mom wants to renovate rather than sell the estate, which means they're not going back to the city...or Seda's friends and school. As the days grow shorter, Seda is filled with dread. They're about to be cut off from the outside...

"April thought she had her happy ending. After all, she has her new house and new friends and new guardian. But she also has a very big new secret. The kids of Winterborne House are the only ones who know that Gabriel Winterborne--famous billionaire and terrible cook--is really a sword-wielding vigilante. What they don't know is that he's not the only one. When a masked figure breaks in, looking for something--or someone--it's clear that Gabriel has...

During the Great Depression, aspiring reporter Kit Kittredge uncovers a mystery surrounding a secret room in the rundown mansion owned by elderly Miss Mundis.

Helen Vaughan doesn't know why she and her mother left their ancestral home at Harrowstone Hall, called Harrow, or why they haven't spoken to their extended family since. So when her grandfather dies, she's shocked to learn that he has left everything--the house, the grounds, and the money--to her. The inheritance comes with one condition: she must stay on the grounds of Harrow for one full year, or she'll be left with nothing. There is more at stake...

When timid Elizabeth's father takes her and her fearless friend, Zenobia, to his family home, Zenobia becomes obsessed with finding a ghost there, and then Elizabeth learns she had an aunt who disappeared from the house years ago.

"Sam and Asha. Asha and Sam. Their friendship is so long established, they take it for granted. Just as Asha takes for granted that Donnybrooke, the mansion that sits on the highest hill in Coreville, is the best house in town. But when Sam is accepted into snobbish Castleton Academy as an autistic 'Miracle Boy,' he leaves Asha, who is also autistic, to navigate middle school alone. He also leaves her wondering if she can take anything for granted...

Herculeah Jones gets involved in another dangerous mystery when she goes to visit old Mr. Shivers Hunt, resident of the forbidding Hunt House.

"Solve the mystery of a burglary at the mansion of mazes, using math to solve geometry puzzles involving shapes, space, and measurements"--

While visiting New York City in 1901, thirteen-year-old Mandie uncovers a mystery in the Guyer mansion where she is staying.