March's niece witnesses her husband die in a plane crash. Soon after she begins to complain she can hear his voice in the night and others in the house become convinced her husband has returned as a ghost.
Colonel March is on holidays in France when he meets an old friend from the French police who tells him of a murder at the docks. The French suspect he was a smuggler who had English contacts. March decides to aid them in their investigation.
How did Davos end up with a knife in his back? The murder happened behind the "silver curtain" of spray from a fountain. He was alone with Jerry Winton in a dead end alley, but Winton didn't do it. Can Col. March unravel the mystery?