Manipulation and detective work

“Spade, who had held his breath through much of this speech, now emptied his lungs with a long sighing exhalation between pursed lips and said: ‘You won’t need much of anyones help. You’re good. You’re very good. Its chiefly your eyes, I think, and that throb you get in your voice when you say things like Be generous, Mr. Spade’ ” (Hammett 35)

Spade uses his “help” to his advantage by draining as much money out of Brigid he can while she appears to be at his mercy, but he is still cautious of her captivating vulnerability. While Spades morality is questionable because he seems to be using his upper hand in the situation to his advantage, he also just wants to know the truth so that he is not painted to be the murderer for protecting her because suspects that she is manipulative and is still not telling him the complete truth.