Mr. and Mrs. Graham were an odd couple, people said. Not weird, not strange, but odd in the way of that word that doesn’t get used much nowadays. They could be called eccentric. But eccentric people are usually wealthy or important in some way. You would know what I mean if I said, “that eccentric old woman who lives in the Greentown Mansion and who hasn’t mowed the grass in several years.” Oh, that woman, you’d think. Or the former lawyer who only represented murderers and who lives alone in a log cabin in the back of his private forest, and plays the violin on Thursdays for himself. Yes, that…