Nate the Great investigates the mysterious disappearance of the purple plastic octopus that his baseball team uses for second base.

The adventures of the Alden family as they ride across country in a caboose that has a strange history--or is it a mystery?

Dink and his friends unearth the mysterious truth behind the envelopes incorrectly delivered to his house.

As her senior capstone project, Pippa Fitz-Amobi is determined to find the real killer in a closed, local murder case, but not everyone wants her meddling in the past.

When Rosamond's birthday gift for Nate disappears from her sled, the boy detective decides to unravel the mystery. In braille with interlinear typescript.

After the Boxcar Children move in with their grandfather, they spend the summer having adventures on a private island.

Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace.

Encyclopedia Brown, boy detective extraordinaire, solves ten new cases, including "The Case of the Miracle Pill, " "The Case of Nemo's Tuba, " "The Case of the Lawn Mower Races, " and "The Case of the Air Guitar." Solutions provided at the end of each chapter.

Nate the Great and his dog Sludge look for Annie's housekey which has mysteriously disappeared.

Two eleven-year-old misfits try to solve the mystery of a dead magician and stop the evil Dr. L and Ms. Mauvais, who are searching for the secret of immortality. This is the story of a secret, and also a secret story. This is the story of Cass and Max-Ernest, two friendless 11-year olds who come together to solve the mystery surrounding a dead magician and the clues he left behind. When they find a mysterious case containing vials of liquid labeled...