Wait For Me by Heather Carson

Three days.
3 days until Tessa gets her husband back from his military deployment. 72 hours until she and the kids can hold Landon in their arms again. 4,320 minutes until she doesn’t have to live life alone anymore.
And then the lights go out.
Solar flares and multiple coronal mass ejections wrack havoc on the power grid and bring the earth to a screeching halt. The internet doesn’t work. All communications are disrupted. And people are running out of water in the dry Southern California desert.
Landon’s ship is still out to sea while Tessa is forced to take care of her young kids in a new town and trust in her neighbors who she barely knows. But can she trust them? Or does she need to seek safety somewhere else?
Three days isn’t too long to wait for the love of your life.
Unless the world as you know it is crumbling at your feet.