If you encountered this title somewhere, it's likely:
* A misremembered title: The actual title might be similar but different.
* A fictional story: It could be from an obscure book, short story, or fan fiction.
* A joke or pun: The combination of Magruder (a figure known for deception) and "bats in the belfry" might be intended as a humorous or satirical title.
To get a summary, you'd need to provide more context, such as where you encountered this title.