Daniel
Tom's coworker. Straightforward.
Daniel has worked with Tom for six years. He's a good architect and a straightforward person, and Tom finds that restful. He's the first to notice Tom's mind is somewhere else.
"You seem like you're somewhere else this week."Chapter 8
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Daniel is the one who tells Tom that Claire called the office's main line one morning to ask whether he'd arrived. That's how Tom learns Claire has started watching him (Chapter 23).