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Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

When three leprechaun statues disappear just before St. Patrick's Day, Bradley, Brian, Nate, Lucy, and other friends follow clues in order to prove that Lucky O'Leary is innocent of the crime.

As a Father's Day gift to the twins' Dad, Bradley, Brian, and their cousins Lucy and Nate try to identify and stop whatever creature is biting fruits and vegetables in the garden.

Bradley and Brian need help from Nate and Lucy after a hypnotist turns their mother into a duck but does not quite get her changed back.

While trying to hide an incriminating report card and dodge meddling siblings, fifth-grade twins Hunter and Zack set out to save their town from a diabolical dentist who is planning to blow it to smithereens.

After their parents' divorce, Rachel and Adam are sent to live with their grandmother in the English village of Triskellion, where they find danger and paranormal activity as they discover hidden secrets that some will kill to keep buried.

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

Allie is overwhelmed when her boyfriend, Trip, dies in a car accident, leaving her scarred and unable to recall what happened that night, but she feels she must uncover the truth, even if it could hurt the people who tried to save her from Trip's abuse.

Twins, Grace and Marty, along with a mysterious uncle, are dropped into the middle of the Congolese jungle in search of their missing photojournalist parents.

Bradley, Brian, Nate, and Lucy visit a haunted hotel on Halloween, but once inside they realize that they have seen plenty of people going in and none coming back out.

In a Mumbai market, twin detectives Ethan and Ella investigate why a spice seller's spices have suddenly gone bad.

"Echo Ridge is small-town America. Ellery's never been there, but she's heard all about it.

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.

"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.