Justin Halpern had a best-selling nonfiction book, co-created “Harley Quinn,” is co-showrunner for “Abbott Elementary” and has recently published his first novel, “Get Lost.” Baseball is integral to Halpern’s own character arc and to “Get Lost” both on the page and behind the scenes. The novel follows Lila Dixon, an acerbic, cynical baseball scout living a dreary and closed-off life in her 30s. The adaptation of “S— My Dad Says” for television failed but he felt he improved with each successive show. “I’ve had a super blessed writing career, but the highest highs I’ve ever had are on a baseball field.”