Sophie and her friends, who call themselves The Red Blazer Girls, embark on solving a case involving mistaken identities, switched paintings, and some priceless family heirlooms.

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.

Orphan Elizabeth Somers's malevolent aunt and uncle ship her off to the ominous Winterhouse Hotel, owned by the peculiar Norbridge Falls. Upon arrival, Elizabeth quickly discovers that Winterhouse has many charms-most notably its massive library. It's not long before she locates a magical book of puzzles that will unlock a mystery involving Norbridge and his sinister family. But the deeper she delves into the hotel's secrets, the more Elizabeth starts...

Winston and his friends enter an all-day puzzle contest to win fifty-thousand dollars for their school, but they must also figure out who is trying to keep them from winning. Puzzles for the reader to solve are included throughout the text.

Twelve-year-old Travis is invited to become a member of The Legend, Lauer Middle School's most exclusive secret society, but first he must solve seven puzzles.

Three Chicago students, Melissa, Wilf, and Bondi, are unlikely participants in a competition for a ten thousand-dollar scholarship, unaware that there is much more at stake.

"With the defeat of the Overtakers behind them, the five teenagers known as the Kingdom Keepers should be celebrating. By all accounts they saved Disneyland from certain destruction. Why then did their mentor leave one last puzzle for them to decipher? The Keepers must solve a puzzle of the past, or be crushed under an evil that makes the Overtakers seem like gentle souls"--

"When Celia and Tyrus discover the four lost diaries of Charles Dodgson (a.k.a. Lewis Carroll), they are pulled into Wonderland and must solve riddles and puzzles to stop the Queen of Hearts from opening a door and taking over our world"--

The Problim siblings must solve a puzzle, find a treasure, and rescue their little brother, Toot, from the villainous Cheesebreath.

Winston Breen and his friends Mal and Jake accompany Mr. Penrose for a weekend of puzzles and games at the mansion of a famous musician. Over the course of the weekend, some guests' prizes and belongings inexplicably disappear. As the group continues with the elaborate puzzles-which the reader is invited to solve too-some of the guests try to figure out who is stealing things, and others become suspects. But in the end it's Winston who stumbles upon...