Picture this—It’s 1,000 years into the future, and Earth is a dying world. The ocean itself has become The Caul, a predator that lures in and devours anyone that goes near it. Humanity has fled the planet, and few people dare to return.  Mae Jameson is an octogenarian former Service agent who arrived on Earth 30 years ago to find her lover. When she encounters Siofra, a mute girl, wandering alone by the shore and returns home, they discover the girl's father, rogue scientist Carl Magellan, hanging from a noose. Unwilling to leave the matter in the hands of the facility Carl abandoned years ago, Mae takes Carl’s journals—which detail his obsession with the Caul and its mysteries—and sets about investigating. That’s the story of “Exo,” the debut sci-fi novel by Colin Brush, out on Nov. 18. In this episode, Colin talks about what the Caul is and what inspired its creation. He and I discuss protagonist Mae Jameson and the quest before her, and the role tat Siofra plays in the book. We go into his lengthy background in literature and how that helped, and look at the possibility of a second book.