Final answer:
Kady Grant and Ezra Mason, characters from the book 'Illuminae', lived on Kerenza IV, an illegal mining colony, before it was invaded.
Step-by-step explanation:
In the science fiction novel Illuminae, characters Kady Grant and Ezra Mason lived on the planet Kerenza IV before the invasion. Kerenza IV is an illegal mining colony situated on the edge of the universe, which comes under attack at the beginning of the story.
The invasion triggers the sequence of events that the rest of the book follows, with Kady and Ezra becoming refugees on a fleet of escaping spacecraft after their world is destroyed.