In 1989, Corey Feldman and Corey Haim were barely 18 and on top of the world. Child actors made good, they had starred in quick succession in three teen classics—the box office hit The Lost Boys, License to Drive and Dream a Little Dream—that meant everything if you were anywhere near high school age at the time. And they had each other, the two Coreys by each other's side as they navigated the wild world of Hollywood. A world that's never wilder than when you're a young heartthrob, awash in fame, attention, money and seemingly endless possibilities. Feldman was a Los Angeles native who got his first acting credit at 8 as "Boy at Museum" in the...