After: First Light by Scott Nicholson is an intriguing book about a massive solar storm that wipes out all technology.
The survivors struggle to adapt only discover some of them have changed. I gave it four stars.
I received a complimentary copy from Haunted Computer Books. That did not change my opinion for this review.
Link to purchase: https://www.amazon.com/After-First-Light-AFTER-post-apocalyptic-ebook/dp/B00D5FAP3O