"The Phantom Wife" - Huh. Okay then. I wouldn't really call this a mystery.
A teacher divorces his wife, believing her to have cheated on him. The wife kills herself, and then the teacher is soon found murdered. The teacher's servant sees the scene of the crime and thinks the wife came back as a ghost and killed him (many of Osaka's murder mysteries start with someone thinking they have a root in the supernatural), but of course that wasn't what happened. Rather than deducing everything, the doctor who examines the body figures out just enough to know where to go next, after which they find a letter that explains everything. I think this is the second time this has happened. Not really my favorite thing for a mystery to do.
Next up, "The Mesmerising Light."