KUALA LUMPUR, Malaysia (AP) — A paranoid dictator's estranged brother. Two young female assassins. A crowded international airport. And a mysterious poison that kills within hours. It's the perfect recipe for a thrilling cloak-and-dagger spy novel. Except some — or possibly even all — of this tale could be true in the apparent assassination of Kim Jong Nam, the older half brother of reclusive North Korean leader Kim Jong Un. And just like similar intriguing cases from the past, the public is hanging on to every detail because there's just something about murder by poison that captivates. "A gun announces its mischief; poison can sneak in with a sip of champagne," said Robert Thompson, a pop culture expert at Syracuse University.