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Thirteen-year-old Robert "Qwerty" Stevens uses the time machine he finds in his back yard to visit Thomas Edison's workshop in 1879, and there helps develop the electric light bulb, but then needs his sister's help to return to his own time.

When they travel by train across America, Christina, Grant, Mimi, and Papa find themselves facing mysterious mishaps, spooky surprises, and treacherous tunnels.

Seventeen-year-old Sam seems to have everything until she and her best friend, Cassie, disappears one night and now Sam has returned with amnesia, striving to be a much better person and aware that her not remembering may be the only thing keeping her alive.

When Teddy Fitzroy is blamed for kidnapping Kazoo the Koala, Teddy realizes he must find and bring Kazoo back to FunJungle--or else Teddy will be sent to juvie as a koala-napper.

Seventeen-year-old Charlotte has escaped her abusive parents and finally changed her name and identity.

When sixteen-year-old Avery West learns her family is part of a powerful and dangerous secret society, and that her own life is in danger, she must follow a trail of clues across Europe.

Precocious eleven-year-old self-made-supersleuth Sophie "Sesame" Seade investigates the disappearance of Jenna Jenkins, a student at Cambridge University, where Sophie's father is chaplain and her mother is Head of Christ's College.

When a new shark species is discovered off the Carolina coast, Mimi and Papa take Avery and Evan to Palmetto Bluff to learn more about it.

Avery, Ella, and Evan investigate a mystery involving rattlesnakes.

Billy Zeets has a story, and he wants to tell it. He is the neighborhood kid everyone suspects whenever there is a vandalism, theft, or bloodied nose.

"Justina 'Ju' Feliciano and her fellow seventh-grade sleuths are on the case! A sneaky vandal has damaged scenery from the middle school drama club production and the newbie detectives must catch the culprit before opening night.

Augie Hobble lives in Fairy Tale Place, a place which is not as magical as its name promises--it is his father's rundown amusement park.

When their daughter Marley goes missing, Rachel and Paul, getting no help from the police, turn to Facebook and Twitter, but when Rachel blows a television interview and shocking secrets come to light, the blogosphere is convinced she is a suspect in Marley's disappearance.

With help from their cousin Harry, eight-year-old twins Ella and Ethan discover who is illegally taking coral from the reefs near their aunt and uncle's beach house on the shore of Australia's Coral Sea.

Twelve-year old orphan Emma Casey lives by a haunted graveyard in her Tennessee town, giving tours, and helping her brother and Granny Blue with the family bakery, and waiting for the destiny dream of her ancestors--but when it comes it shows her only a key, and she finds that she must solve a ghostly mystery that has haunted her town for generations.