Shadow on the Sun (Hell's Cross #3)

Durango has always relied on Mimi--once his tough-as-nails squad leader, she is now the bitingly sarcastic artificial intelligence flash-cloned to his brain. Mimi is the only reason he is alive.

Durango has always looked out for his beautiful and brave second-in-command, Vienne--now wounded, crushed, missing. Vienne is the only reason he wants to live.
Durango hasn't always despised his father. But he does now. Lyme wants Durango to be the Prince of Mars, and he'll stop at nothing to realize that dream. He'll sacrifice anything and anyone in the name of domination. Even Mimi. Especially Vienne.

Lyme forgot one thing: You don't want to mess with Durango.