After Bess Silver had settled into her new home in Pineview she thought her biggest problem would be settling into a new school. She was surprised to learn that it was a one room school house which was different from what she was used to.

That all changed when Megan Skye, her best friend and cousin, dashed into their kitchen late one afternoon with exciting news. Megan's father discovered an old cabin, hidden behind a wall, when he started doing kitchen renovations. Megan asked him to take the suitcases, ledgers and trunk they found over to Bess instead of throwing them out. Clues turn up in the suitcases and in a secret compartment in the cabin which leave Bess puzzled. When she first looked around the cabin she sees a ghostly figure that disappears in an instant but is as real as Megan. Dreams about the cabin and occupants haunt Bess. These feel so real that she can't shake the feeling that she was actually near them.

Who is the figure that Bess saw in the cabin? What is she trying to tell her? Why is she having dreams about the old cabin? Will Bess be able to figure  out who the mysterious figure is? Or would these secrets remain secrets forever?

The Mystery of the Hidden Cabin is the sequel to Bess's Magical Garden and can be read on it's own.