The Riddler has kidnapped Batman and left a trail of riddles for Robin to solve before the next sunrise--or Batman will be gone forever.

When Stevie Bell, an amateur detective, begins her first year at a famous private school in Vermont, she sets a plan to solve the cold case involving the kidnapping of the founder's wife and daughter shortly after the school opened.

"With time running out as the twelve nights come to an end, Kay must puzzle out the riddles laid before her in this new land of Bithynia--and help restore the world to order--before her dad and sister are gone forever."--

As a slave in the Kipchak Khanate, Jinghua has lost everything: her home, her family, her freedom. She becomes an unlikely conspirator in the escape of Prince Khalaf and his father from their enemies across the vast Mongol Empire. Jinghua hatches a scheme to use the Kipchaks' exile to return home. Her feelings evolve into a hopeless love, as Khalaf seeks to restore his kingdom by forging a marriage alliance with Turandokht, the daughter of the Great...

Ten-year-old Flavia and her friends encounter the Roman admiral Pliny before making a journey to her uncle's farm near Mt. Vesuvius, where they try to solve a riddle, reunite a family, and get out of the path of a natural disaster.

William must solve a witch's riddle in order to save his family and end a centuries-long curse.

Kids will love this exciting excavation of ancient Egyptian myths as they follow along with the clever Marcy on a quest to save her dad from the belly of the sphinx! Many years have passed since the tale of Arthur and the Golden Rope, and Arthur is now a world-famous adventurer. If only his daughter Marcy shared his enthusiasm for exploration... Determined to bring out Marcy's adventurous side, Arthur sets off to Egypt to bring back the legendary...

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

"Anouk, Ben and Cara dream of a fabulous treasure buried on the golden island across the harbor. A mysterious and grizzled old man offers them passage on his boat, but only if they can solve seven vexing riddles. If they succeed, a strange and magical prize awaits them"--Amazon.com.