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Queenie is a cat, deeply aware of her own perfection, and Arthur is a dog who normally likes everyone (except Queenie who is devoted to making his life a misery), and they both live at the Blackberry Hill Inn in the Northeast in snow country with their human twins (Harmony and Bro), and Mom; but one winter's day an unpleasant and suspicious stranger comes to stay at the inn, and soon the twin's uncle is framed for murder--and Queenie and Arthur must put aside their differences and work together to solve the mystery and protect their humans.

"Queenie the cat has a BIG problem. And for once, it's not the slobbery, overly-excited creature who also lives at Blackberry Hill Inn.

While playing lacrosse, third-grade twins Zach and Zoe search for the culprit who damaged Mateo's lacrosse stick.

"It was only a few days ago that Tess Biedermann, Theo Biedermann, and Jaime Cruz, along with a mysterious figure from the past, managed to survive an assault on the locationof the latest clue in the Morningstarr cipher -- and, in theprocess, made a shocking discovery about their own connection to this one-hundred-sixty-year-old enigma.

While true-crime aficionado Ellery and her twin brother are staying with their grandmother in a Vermont community known for murder, a new friend goes missing and Ellery may be next.

Twins Theo and Alexander along with their sister Wil are abruptly dropped off at their Aunt Saffronia's house, where they learn they must complete a series of tasks in order to see their parents again, the first of which is solving a mystery at the Fathoms of Fear waterpark.

Aunt Saffronia drops the Sinister-Winterbottoms off at the Sanguine Spa, which is possibly owned by vampires, and where they must continue to complete the tasks they have been set if they are to see their parents again.

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

Twins Theo and Alexander, their older sister Wil, and five new friends find themselves at an electrifying manor run by Mister Frank and Dr.

After their guardian disappears, twelve-year-old twins Jess and Jude are fostered by the Blakeney family, but their search for information about their parents puts them in danger when they uncover secrets their wealthy benefactors want to keep hidden.

Following the clues left behind, Theo and Alexander find themselves at Siren's Song Seaside Amusement Park, where they must work together to escape, stop their newfound nemesis Essa, save Wil and their friends, and find their parents.

Following the clues left behind, Theo and Alexander find themselves at Siren's Song Seaside Amusement Park, where they must work together to escape, stop their newfound nemesis Essa, save Wil and their friends, and find their parents.

Twins Theo and Alexander, their older sister Wil, and five new friends find themselves at an electrifying manor run by Mr.

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

Hope and Gordon Smith navigate the complexities of their extended family, but when Elizabeth Springer goes missing, Hope reveals that she is their grandmother and follows a cryptic letter hinting at more family secrets and an estranged grandfather.