Cooper is lost. Ever since his father left their family three years ago, he has become distant from his friends, constantly annoyed by his little sister, Jess, and completely fed up with the pale, creepy rich girl who moved in next door, who won't stop staring at him. So when Cooper learns of an unsolved mystery his sister has discovered online, he welcomes the distraction. It's the tale of a deadly train crash that occurred a hundred years ago in...

Catholic-schooled seventh-graders Sophie, Margaret, Rebecca, and Leigh Ann help an elderly neighbor solve a puzzle her father left for her estranged daughter twenty years ago.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.

Bowser is a mutt, just adopted by eleven-year-old Birdie Gaux and her grandmother, but when they all get home to Grammy's bait and tackle shop in the bayou they discover that their prize stuffed marlin has been stolen--so Bowser decides to investigate, and things quickly become complicated and dangerous.

When Mia moves to Vermont the summer after seventh grade, she's recovering from the broken arm she got falling off a balance beam. And packed away in the moving boxes under her clothes and gymnastics trophies is a secret she'd rather forget. Mia's change in scenery brings day camp, new friends, and time with her beloved grandmother. But Gram is convinced someone is trying to destroy her cricket farm. Is it sabotage or is Gram's thinking impaired...

Dan Cahill and his sister Amy travel from the hottest to the coldest regions of the world in order to stop someone from using their own power against them.

Skilled code-cracker and detective Ruby Redfort has an adventure at sea in which she must crack the case of the Twinford pirates while avoiding a vile sea monster and the evil Count von Viscount.

Fighting for survival after being separated into pairs in the aftermath of a betrayal, the Project Osiris clones search for notorious mob boss Gus Alabaster while tracking down Eli's elusive DNA donor alongside a surprising new ally.

Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets. But are they ready to face the truth about the Cahills and the key to their unmatched power? After a whirlwind race that's taken them across five continents, Amy and Dan face the most the difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world,...

Aven Green loves to tell people that she lost her arms in an alligator wrestling match, or a wildfire in Tanzania, but the truth is she was born without them. And when her parents take a job running Stagecoach Pass, a rundown western theme park in Arizona, Aven moves with them across the country knowing that she’ll have to answer the question over and over again. Her new life takes an unexpected turn when she bonds with Connor, a classmate who...