1. What is shown by Trahearne's ex-wife hiring a private investigator to follow him?
Trahearne's ex-wife hiring a private investigator hints that Trahearne has an involvement with another woman aside from his wife. An ex-wife who still cares enough about her ex-husband to hire a private investigator probably still has feelings about him. This shows that Catherine and Trahearne have unresolved issues.
2. How does Sughrue's remark about his job and "the chase being over" indirectly characterize him?
Sughrue likes the excitement of chasing people and snooping around for clues. He does not like actually knowing the answer. This indirectly characterizes him as energetic and hyperactive. He wants the busy part of the job and not the resolution.
3. What tone is set when Sughrue says people in his business need "a moral certitude that I no longer even claimed to possess"?
The tone is exciting and nerve-racking. As a private investigator, Sughrue should have morals he follows. He should be respectful to the people he investigates. This statement promises that he will break rules, which makes for an interesting story.
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