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.

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

Mr. Putney has all sorts of animal friends with unusual names.

The Gumshoe Gang has their next case and it hits close to home. One of their own detectives is missing his RC race car and has to crack the ransom note! Caleb needs his car back in order to compete in the school's RC race car race on Sunday and he has no time for these nonsense riddles. Can his friends help him crack the notes? Who would steal a RC race car anyway? And why does it smell like rotten eggs? These mysteries are perfectly suited to keep...

A sultan's daughter who loves numbers and riddles devises a plan to find the man who is best suited to be her husband.

Flying horses from the Royal Guard arrive in Crystal Cove to deliver a message for Sasha, but in order to open it she must first solve a riddle, which requires her to find the petals of rare and different-colored flowers.

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.

"Kay’s father is still missing–and worse, now nine-year-old Ell is too. More determined than ever, and 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." --book jacket

Silly Milly is going on a trip, but what is she packing?

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.