"A sharply written adventure/mystery debut." -Kirkus Reviews Women Air Force Service Pilot and undercover agent Pucci Lewis did not want to go to jail. But how else could she unmask Grace Buchanan-Dineen, an imprisoned countess/counteragent suspected of triple-dealing and possibly putting the country's future at risk? Buchanan-Dineen was a real-life figure who led a German spy ring operating in Detroit during WWII. Confronted by the FBI, she agreed...

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle. Morgan le Fay will make Jack and Annie masters of the tree house if only they can solve four riddles -- which will take four books, of course! Dolphins at Daybreak begins the third set of four books in this magical (and increasingly popular) series! Jack and Annie are off in the Magic...

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.

Destiny leads Rowan of Rin to make choices which could save a powerful crystal, thereby ensuring the safety of his people and his people's shore-dwelling allies.

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

"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. Marie-Grace and Wilhelmina have to unravel the clues...

"After finding a mysterious key, eleven-year-old Lin Rosenquist finds herself in the wintery world of Sylver where all the inhabitants were once either beloved pets or tamed wild animals, and must find the missing Winter Prince before she can return home"--

When Dane, a bully, refuses to hit Billy D because he has Down Syndrome, Billy takes that as a sign of friendship and enlists Dane's help in solving riddles left in an atlas by his missing father, sending the pair on a risky adventure.

The further translation of a manuscript from the lost civilization of Edil-Amarandah which chronicles the experiences of sixteen-year-old Maerad, a gifted Bard, as she seeks the answer to the Riddle of the Treesong and continues to battle the Dark forces.

Invites the reader to solve the riddle of why Silly Milly likes certain things and dislikes others.