Cards Quotes
A lover, when he is admitted to cards, ought to be solemnly silent, and observe the motions of his mistress. He must laugh when she laughs, sigh when she sighs. In short, he should be the shadow of her mind. A lady, in the presence of her lover, should never want a looking-glass as a beau, in the presence of his looking-glass, never wants a mistress.
Henry Fielding
Love interest nearly always weakens a mystery because it introduces a type of suspense that is antagonistic to the detective's struggle to solve the problem. It stacks the cards, and in nine cases out of ten, it eliminates at least two useful suspects. The only effective love interest is that which creates a personal hazard for the detective - but which, at the same time, you instinctively feel to be a mere episode. A really good detective never gets married.
Raymond Chandler