In the Time of the Flash - The Book of Ruin Series, #5

On a day like any other, a series of powerful coronal mass ejections hit Earth, frying much of the planet's tech infrastructure. The world doesn't collapse overnight, and Abigail Tate, a Chicago-tough university student, tags along with her newfound wealthy half-sister to Miami for spring break. But once there, she discovers South Florida has become a dystopian cityscape of prey and predator. A drug called Wisht runs rampant, distorting minds and morphing bodies.
Violent cults called Malforms relentlessly battle each other and hunt Goodfolk in competition with genetically engineered cat-size Komo Spiders, a dangerous EPA failure. And solar storms keep striking Earth, slowly pushing Florida into a new version of the Middle Ages. Abagail's only hope of survival is a group of Miami-Dade sheriff's deputies who save her during a shootout between two cults. The problem is her half-sister got left behind in the rescue - and finding her is not the deputies' top priority.
Searching for a mysterious Father Benoit is, and they won't divulge why. In the meantime, she becomes entangled in government conspiracies, religious zealots and a surprising new passion: aiding the deputies in protecting those who can't defend themselves. THE BOOK OF RUIN SERIESBOOK 1: The Book of Ruin (Winner of the 2020 Indie Reader Discovery Book Award for Science Fiction)BOOK 2: The Flashfall Sword (Recommended by Indie Reader and Readers' Favorite)BOOK 3: RangerKnightsBOOK 4: The Last SkinweaverBOOK 5: In the Time of the Flash