After a flying lizard carries off his little sister, Rowan of Rin and three companions are guided by a rhyming riddle on a journey to the land of their old enemy, the Zebak, in order to rescue her.

Pepper and Jake, sister and brother shepherds, match wits with the giant, Urk, who regularly floods their valley with his dirty washwater.

When an ancient evil threatens to devastate Rin, overcoming its people with a fatal sleeping sickness, young Rowan, with help from a tribe called the Travelers, must decipher a rhyming riddle in order to save the land and its inhabitants.

When her former best friend gets popular and leaves her behind, sixth-grader Ruth prefers to be alone, studying for the school spelling bee, until she finds a riddle in an old book.

"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"--

"Marie-Grace can't wait to begin her journey up the Mississippi River with her father. The steamboat they're traveling on is the biggest and fanciest boat Marie-Grace has ever seen. It's crowded with all sorts of interesting passengers, including Wilhelmina Newman, a girl her age. Wilhelmina is traveling alone, and she's carrying a secret in one of her trunks--clues to hidden Gold Rush treasure."--Provided by publisher.

Ellingham Academy is a famous private school in Vermont for the brightest thinkers, inventors, and artists. It was founded by Albert Ellingham, an early 20th century tycoon, who wanted to make a wonderful place full of riddles, twisting pathways, and gardens. A place, he said, where learning is a game. Shortly after the school opened, his wife and daughter were kidnapped. The only real clue was a mocking riddle listing methods of murder, signed with...

"The Robber Girl has a good dagger. Its voice in her head is as sharp as its two edges that taper down to a point. Today, the Robber Girl and her dagger will ride with Gentleman Jack into the Indigo Heart to claim the gold that's rightfully his. But instead of gold, the Robber Girl finds a dollhouse cottage with doorknobs the size of apple seeds. She finds two dolls who give her three tasks, even though she knows that three is too many tasks. The...

While working on a school science project in the forest, Andres and Desmond discover a bridge guarded by a lonely, riddle-loving troll.

The Boxcar Children discover an old wedding photograph and a riddle while on a visit at a neighbor's house, and they embark on a spy game designed by the house's original owner.