_____  – n. unsolvable puzzle left in the wake of a tragedy:
When his wife left the house that morning, her last words were, “I will be your substitute today.” For the rest of his life, he wrestled with the _____  of wondering if his wife had some premonition that she would die and he would survive the bombing of Hiroshima.
Closing the Door, a Haiku written by Mark Dimor illustrating _____ 
One day arm and arm
We left home and closed the door
You never returned
Originally published on the Donna, the book, blog
Mark’s book, Donna, A Photo Memoir of Love and Loss, is a narrative of a marriage focusing on the journey from his wife’s terminal diagnosis to her death in August 2011.