A possible summary is:
A woman narrates her experience of surviving a nuclear apocalypse with her two children and a pet cockroach in a bunker. She is unhappy with her husband who did not make it to the shelter. She sends her children out to scavenge for supplies, but they never return. She also gets a cat that kills the cockroach and leaves her. She gets sick and trades with other survivors, hoping for a first aid kit. She decides to go out herself, but finds her shelter raided by someone named Marlin. She leaves a note for anyone who reads it and joins the raiders.
Here are the extracted key facts in short sentences:
1. Dolores is a single mom who wants to leave her husband.
2. Dolores's family has a shelter to protect them from a nuclear apocalypse.
3. Dolores and her two children, Timmy and Mary Jane, are in the shelter.
4. Dolores is unhappy in her marriage and wants a divorce.
5. There is a nuclear apocalypse, and Dolores's husband does not survive.
6. Dolores and her children are struggling to find food and water in the shelter.
7. They have a radio that can receive signals from the outside world.
8. They hear a voice on the radio speaking in a foreign language, which they later discover is Canadian.
9. Mary Jane goes outside to find medicine for Dolores, but does not return.
10. Timmy goes outside to find medicine for Dolores and returns with some supplies.
11. Timmy becomes ill and Dolores is forced to make a difficult decision about who to save.
12. A group of survivors from a nearby town contacts Dolores and asks for help.
13. Dolores and her son Timmy visit the group of survivors, who are mostly children, elderly, and injured people.
14. Dolores and Timmy trade some of their supplies for a first aid kit.
15. A cat appears in the shelter, and Dolores and Timmy decide to keep it.
16. The cat kills the mutated cockroaches in the shelter.
17. A group of men comes to the shelter and takes the cat, but later returns it.
18. Dolores and Timmy go on an expedition to a nearby retirement home to scavenge for supplies.
19. They find a map and decide to visit a location marked on it.
20. Timmy goes on another expedition, but does not return.
21. Dolores is left alone with the cat and decides to go on an expedition to find Timmy.
22. She finds bizarre symbols and profanities painted on the walls of her house and a sign that reads "Marlin rules here."
23. Dolores discovers that her shelter was raided, and she was driven away to start a new life with the raiders.
24. Dolores survives for 51 days and starts a new life as a single former single mom.