"I like to collect knives," says Angelina Jolie, "but I also collect first edition books." At first glance, she might seem to be someone without any secrets, talking openly about her love life, sexual preferences, drug use, cutting, and tattoos--and why she kissed her brother on the lips in public. And yet mysteries remain: What was really going on in her brief, impulsive marriages to Jonny Lee Miller and Billy Bob Thornton, and what is going on in...