Before I read this I wasn't aware of a short mystery story written by Louisa May Alcott. "The Mysterious Key and What it Opened" is intriguing enough by the title, and once I started reading there were characters who were suspicious, but their reasons weren't obvious. Now that I've read it, I can go back and see clues right from the start, but Alcott wove a few little twists into the story and just enough to throw the reader off.
Several of the characters harbor secrets, but what they are will be revealed later in the story and what the mysterious key opens was a complete surprise to me. A grieving widow, the daughter, a strange young man who shows up and stays, and shadows in the night all make for a very good mystery that is a bit different from what I'd expect from Louisa May Alcott. A very pleasing story.