Books like The Mysterious Benedict Society by Trenton Lee Stewart

A young orphan girl from Canada makes her way to a Prince Edward Island farm and becomes a cherished member of a family there, all while proving she has a talent for making friends and learning languages.

Sixteen people were invited to the reading of the very strange will of the very rich Samuel W. Westing. They could become millionaires, depending on how they played the game. The not-quite-perfect heirs were paired, and each pair was given $10,000 and a set of clues (no two sets of clues were alike). All they had to do was find the answer, but the answer to what? The Westing game was tricky and dangerous, but the heirs played on, through blizzards and burglaries and bombs bursting in air. And one of them won! With her own special blend of intricacy, humor, and upside-down perceptions, Ellen Raskin has entangled a remarkable cast of characters in a puzzle-knotted, word-twisting plot. She then deftly unravels it again in a surprising (but fair) and highly satisfying ending. - Back cover. The mysterious death of an eccentric millionaire brings together an unlikely assortment of heirs who must uncover the circumstances of his death before they can claim their inheritance.

In the country of Carthya, a devious nobleman engages four orphans in a brutal competition to be selected to impersonate the king's long-missing son in an effort to avoid a civil war.

"Are you a gifted child looking for special opportunities?" Dozens of children respond to this peculiar ad in the newspaper and are then put through a series of mind-bending tests, which readers take along with them. Only four children--two boys and two girls--succeed. Their challenge: to go on a secret mission that only the most intelligent and inventive children could complete. To accomplish it they will have to go undercover at the Learning Institute for the Very Enlightened, where the only rule is that there are no rules. But what they'll find in the hidden underground tunnels of the school is more than your average school supplies. So, if you're gifted, creative, or happen to know Morse Code, they could probably use your help.

When strange and seemingly unrelated events start to happen and a precious Vermeer painting disappears, eleven-year-olds Petra and Calder combine their talents to solve an international art scandal.

A tale of friendship, education, and the challenges of high school for a young protagonist in Canada, inspired by the author's own experiences.

Two eleven-year-old misfits try to solve the mystery of a dead magician and stop the evil Dr. L and Ms. Mauvais, who are searching for the secret of immortality.

Join the Mysterious Benedict Society as Reynie, Kate, Sticky, and Constance embark on a daring new adventure that threatens to force them apart from their families, friends, and even each other. When an unexplained blackout engulfs Stonetown, the foursome must unravel clues relating to a nefarious new plot, while their search for answers brings them closer to danger than ever before. Filled with page-turning action and mind-bending brain teasers, this wildly inventive journey is sure to delight.

Score, Pixel, and Renald: A Magical Quest in the Diadem Universe

When four twelve-year-olds, including Logan, who has grown up never leaving his parents' Life Is Sweet candy factory, compete in the Confectionary Association's annual contest, they unexpectedly become friends and uncover secrets about themselves during the process.

Three orphaned girls and a governess set out on a wild hunt in London.

Ages 8-14

A young child's quest to save the world from a malevolent artificial intelligence genius and the villainous forces he serves, set in a sci-fi universe where the line between good and evil is thin and the stakes are high.