THE MYSTERY OF THE FOLDING KEY

I suppose she still has her market, but this seems incredibly slim and prim. Chuck and his sister June, while collecting for the scrap drive, come across a folding key in the home of Miss Abby. The discovery shocks Miss Abby strangely, she loses her memory. The children set to work to solve the puzzle -- and bring peace of mind and the exoneration of a beloved brother to their old friend.