Actually, I'm working on my own murder mystery right now - it's about a hard-drinking private eye who's trying to redeem himself after being kicked off the force.
They quarreled over Cambodia and Pol Pot. Shirley thought Pol had gone too far but Jane didn't think he'd gone far enough. So, all these years later they bump into each other and start commiserating over their worthless, rebellious, Republican children, until Shirley accidentally brings up the "C" word. That's right ... Cambodia ...