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 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.

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

After a mysterious key arrives for her, eleven-year-old Lin Rosenquist finds a crack in the cellar, a gate to the world of Sylver. This frozen realm is the home of every dead animal that ever loved a child. Lin is reunited with Rufus, the pet she buried under the rosebush and together they must find the missing Winter Prince in order to save Sylver from destruction.

Nine simple riddles with clues hidden in fabric collages.

Scatterbrain Sam finds true love while gathering ingredients for the mysterious glue stew that is supposed to make him smarter.

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

As two children take a walk with their grandfather, they use their counting skills to help answer a series of animal riddles. Includes related activities.

Tiga Whicabim is settling in to the witchy, glitzy world of Ritzy City where Peggy is Top Witch, but when Fran the Fabulous Fairy visits Linden House, the girls realize that witches all across town are starting to disappear.

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.