Marigold concocts a mystery that finally gets her and her friends into the boys' private eye club.

Jack Russell investigates when all of the dogs who live in Doggeroo are hiding under their beds in fear.

Though scoffed at by Harold the dog, Chester the cat tries to warn his human family that their foundling baby bunny must be a vampire.

Aunt Eater must interrupt her holiday preparations to solve some Christmas Eve mysteries.

The children are staying at the home of a famous inventor who was known for her one-of-a-kind clocks. All the clocks make noise especially at midnight, when there are enough chimes, gongs, and clangs to wake thw whole house up! But the clocks aren't the only sound in the house at midnight. Someone or something is making a mysterious tapping sound. Who could be inventing trouble in the old house?

"Eight-year-old Ada, who has a knack for science, math, and solving mysteries, teams up with her best friend, Nina, to find a missing dog."--

At the Sword Mountain Race, some are more interested in stealing the new plans for Speed's car, the Mach 5, than winning the race.

The Alden children help out at the Greenfield Ic Cream Barn and while learning to make ice cream and create new flavors, they help solve a mystery before the Barn gets shut down.

When Grandfather's friend Charlotte bought a mysterious mansion known as Skeleton Point, she invited the Alden children to help her fix it up.

Four orphans take shelter in an old boxcar during a storm, and, determined to make it on their own, they turn it into a safe, cozy home.