After years in foster care, April gets to live in a mansion where she and four other children are caught up in a mystery related to a missing heir, a lost legacy, and the Phantom.

"Clara Starling lives a life of dull rules, deadly routine, and flavorless meals under her cold uncle's strict regime--until the day Uncle disappears, leaving Clara alone in his old mansion. When streetwise orphan Peter and his rescue cat arrive unexpectedly, the children seize the chance to live by their own rules. But when the pair's wild romps through the halls of Braithwaite Manor reveal a single, worn ballet slipper, they are hurled into a mystery...

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

"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...

Winston attends a weekend of puzzles at a famous musician's mansion, but when he and other young guests pursue a thief, they find themselves in big trouble. Puzzles for the reader to solve are included throughout the text.