The Boogeys.

Set in a near future where Earth has been turned into a planetary ghetto by an alien species (informally called the 'Boogeys'), our story follows Jack Dawkins, a former-cop-turned-pickpocket as he tracks down a missing child about to be sold to an alien overlord. The encounter will determine the fate of the child's life, and Dawkins' redemption from the failures of his past.