In The Silver Candlestick Murder Case, Mr. Keen, a famous investigator, is approached by Mrs. Grace Denning, who is frantic over the disappearance of her husband, Neil. The young actor had been struggling to find work and resorted to modeling for artists. Just before his disappearance, he received a mysterious phone call that left him shaken. Grace overheard Neil say he was going to a dangerous meeting, and now, nearly 24 hours later, he has not returned home. Keen's instincts tell him that something sinister is afoot.