Shadow of the Scorpion

Seamlessly blending space opera, hard science fiction and cyberpunk, Neal Asher's Shadow of the Scorpion is a gripping prequel to the compelling Agent Cormac series.
Following the devastation of the human-prador war, Ian Cormac is employed by the Earth Central Security. Yet he is haunted by childhood memories of a sinister scorpion-shaped war drone and the burden of losses he doesn't remember.
Tasked with restoring order on worlds ravaged by alien warfare, his cold capacity for violence soon makes him one of Earth's top agents. But chilling discoveries propel Cormac onto a path of revenge and revenge, where he'll have to use all his hard-won skills just to stay alive.