Ripcord

A drug called Ripcord has become the world's principal catastrophe. Fiercely addictive, it does not merely alter perception but rewrites the person taking it, turning users into something closer to animals. Against that collapse, Dillion's sister has gone missing in the Australian Outback, and the book is about the lengths a person will go to in order to recover their family while everything around them fails. Bleak, propulsive, and intended for mature readers.