Related Clues:

• Agatha Christie's genre
• What often comes with a twist?
• Object of speculation
• Well, change what's central to narrative, producing this, perhaps
• Elvis Presley's kind of train
• Play featuring Mary, heartless queen imprisoned in hovel
• Mediaeval trade associated with Macavity
• My Way very lacking in volume, which is hard to explain
• Secretive person decapitated and buried in my tale of suspense
• Something difficult to understand
• Unexplained happening
• Something hard to explain
• Expertise, taking year for a puzzle here
• My better half is taken in by extremely shady enigmatic type
• Puzzling crime novel