While visiting New York City in 1901, thirteen-year-old Mandie uncovers a mystery in the mansion where she is staying.

Lois Gladys Leppard, author of the ever-popular "Mandie" books, is back with a new adventure. Her fans asked for another story that brings Mandie and her friend, Jonathan Guyer, back together. In this new episode, Mandie and Celia travel to New York. But they hardly arrive at the Guyer's mansion when a robbery takes place--with Mandie and Jonathan in hot pursuit of the thief.

Mandie and her friends search for Mandie's aunt's missing turkey. In doing so, they uncover other mysteries including a missing doctor.

Mandie, Snowball, and Celia become trapped in a dark and creepy secret room in the schoolhouse basement. Can Mandie discover the meaning to the mysterious writing on the wall and find a way out?

On a cold night, a mysterious gift is left on the doorstep with an anonymous note attached that reads, "For Mandie". The box has fancy gift wrapping on the outside, but inside is what appears to be a childish jumble of holly--until Joe suggests it's a treasure map. Let the adventure begin!

Mandie and her friends search for a hidden mystery in the tunnel behind a crack in the wall.

Someone is going through Mandie's and Celia's rooms and Mandie's graduation dress is missing.