Marlborough Woods Mystery

On the night of December 1, 1943, Frank Johnson, a Commander in the Royal Navy, returned to his Halifax base after an urgent train trip to New York where he'd visit his wife. She was in hospital there in a coma after what had been described as a tragic car accident. Arriving at his Marlborough Woods home around midnight, Johnson spent the night burning documents in his fireplace.

After that… well, that's when things got interesting.