I read this book on Kindle Unlimited a year or two ago. An electromagnetic pulse event hits while a man is on a business trip in Alaska and his family (a wife and 3 girls, I think) are back home in the lower 48 states. The family is well prepared for such an event with guns and supplies. The story follows the man trying to get home while his family copes with deteriorating conditions in their suburban neighborhood. The man's journey includes travel on a boat to one of the Aleutian Islands. I believe the book ends with the family deciding to leave for a cabin they have somewhere. There were sequels intended.