Its a 1st person fictional diary "written" by a woman who survives nuclear war. It's written in handwriting and has doodles in the margins as if it were real. I'm thinking maybe she lived in England, but I may be wrong on that. Anyway, I think she goes into the shelter without her husband. When she comes out, she finds his remains from where he had been waiting for her instead of going into the shelter himself. At the end, the book just stops, leaving you to conclude that she died.
Jog anyone's memory?