One of the recurring concepts in the Mutant Hunter books is making excursions into dangerous, foreboding places where the characters’ wits, skills, weapons and luck are all that sustains them.

In The Slicks, bounty hunter Leon Miller continues his epic hunt of the last of the Ten Most Wanted mutants—Number Six. The chase takes him into a giant, polluted oil slick that covers nearly a fourth of the planet.

Miller hires a mercenary pilot to take them into the Slicks. As they fly across the outer boundaries of the oil-covered wasteland, I tried to convey a sense of crossing the Rubicon, going beyond the point of no return. I’ve experienced that sensation a handful of times in my life and it’s a powerful, exciting and scary feeling.

Going into The Slicks is hard — getting out alive is damn near impossible.