Six eccentric guests are invited to the home of the infamous Amadeus family where they must work together to uncover the truth behind a thirteen-year-old mystery before the clock runs out.

The first book in the #1 bestselling phenomenon sends readers around the world on the hunt for the 39 Clues!

Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue."Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost....

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 Fun waterpark.

"Desperado Detectives--aka Mo Lo Beau and her best friend Dale, along with newly-appointed intern, Harm Crenshaw--must take on a new case when Dale's daddy goes on the lam just before his trial is about to start"-- Provided by publisher.

"When Colin finds a shoebox full of letters hidden in a stranger's attic, he knows he's supposed to throw them away. That's his summer job, getting rid of junk. But Colin wants to rescue the letters--and find out what really happened to best friends Rosemary and Toby way back in the 1970s. Meanwhile, across town, Nevaeh also finds a mysterious letter. But this one reads like a confession to a crime. And Nevaeh knows her father, the 'Junk King,' expects...

Nine-year-old Nicholas Benedict, a boy without parents and afflicted with an unfortunate nose and narcolepsy, is sent to a new orphanage where he encounters vicious bullies, selfish adults, strange circumstances, and a mystery that could change his life forever.

Five murder suspects are invited to the haunted Barclay Hotel for a weekend getaway, and it is up to twelve-year-old JJ and eleven-year-old Penny--and a lonely ghost--to figure out who committed the crime.

As Pelican Island's history-making drought wears on, the water level on Bex and Davey's beloved marsh reveals the hand of a statue that has been underneath the water for who knows how long, and the siblings are determined to find out more.

"Third-grader Aven Green has been solving mysteries for a whole month, cracking such cases as The Mystery of the Cranky Mom. But can this perceptive detective solve two cases at the same time? First her teacher's lunch bag disappears. Then Aven's great-grandma's dog goes missing. Fortunately, since Aven was born without arms, all the "arm" cells went to her super-powered brain instead (that's her theory)."-- Publisher's description.

The Vickery twins, Lee and Felix, live in a house in Poplar Wood, where, because of the "Agreement," their mother serves Memory, and their father assists Death, and only Lee is allowed to leave the house, except for Halloween; but when a local girl is murdered, Gretchen Whipple, daughter of the mayor, offers the boys a deal--help her solve the crime and she will help them break the Agreement, and regain their freedom.