LOS ANGELES — Adam Leber was nodding off in his Hollywood Hills mansion late Wednesday night when his housekeeper jolted him awake with an urgent message: There’s a fire at the door. Leber — a talent manager whose clients have included Miley Cyrus and Lil Nas X — opened his door and looked. Sure enough, “The entire hillside was on fire,” he said. “It was insane.” Orange-red flames sprung up everywhere, spitting embers dangerously close. Without thinking, he and his wife scooped up their dogs and 3-year-old daughter, threw some belongings in their car and drove east, to take refuge...