Unless you’re a certified saint, you’ve done things that weren’t very nice. Maybe you pulled your sister’s hair as a kid or shoplifted a Mars bar or two. Cut people off in traffic? You might have done worse. But why do most of us keep our antisocial urges more or less under control, while others go on to rob, destroy, and even kill?  I’ve always been fascinated by what motivates nasty characters, both real and fictional. My latest novel, KILLER COIN, explores the dark impulse of greed. I’m not talking about an extra slice of cake but greed so greedy it kills. Worst of all, that sort of greed often involves the people we trust most – relatives, lovers, and spouses. I’ve rounded up five of my favorite true crime podcasts about greed:  1) Criminal – The Money Tree At just 26 minutes long it’s a quick listen and involves no deaths but is guaranteed to shock you. Who can you trust? No one, after hearing this podcast! Bonus: you might feel better about your family. 2) Dateline – The House on the Hill  If you thought things couldn’t get worse after listening to the previous podcast, you were wrong….