What a nice man. Polite—holding the car door for her, even though they had a chauffeur. Moreno had been charming. And talkative. They had some engaging conversations. They were, for instance, both fascinated with language. He was a writer for blogs and magazines and a radio host, while she made her living interpreting other people’s words. They’d spoken about similarities between languages and even technical aspects: nominative and dative and possessive cases, as well as verb conjugations. He told her he disliked English intensely, though it was his mother tongue, which she found curious. One may not like the tonal quality of a tongue for being too harsh—German or Xhosa, for instance—or be dismayed at the difficulty of achieving fluency, like Japanese, but to dislike a language in general was something Lydia had never heard of.

He characterized it as random and lazy (all the irregular constructions), confusing and inelegant. It turned out that his real objection was a bit different. “And it’s rammed down the throats of people throughout the world, like it or not. Just another way to make other nations dependent on the U.S.”

But Mr. Moreno had been opinionated about a lot of things. Once he’d started lecturing about politics, you couldn’t dislodge him. She found herself steering away from those subjects.

She’d have to tell the detective that Mr. Moreno had seemed concerned for his safety. He’d looked around quite a bit as they’d driven through the city and walked to their meetings. Once, they’d left one meeting and were on their way to another when Mr. Moreno had stopped suddenly.

“That man? Haven’t we seen him before, outside the other office? Is he following us?” The person he noted was a young, somber-faced white guy, looking through a magazine. That alone struck Lydia as odd, something out of an old-time detective film, where a PI pretends to read a newspaper on the street while spying on a suspect. Nobody lounges on the streets of New York, browsing through reading material; they check iPhones or BlackBerrys.

Lydia would be sure to tell the police officer about the incident; maybe that man had something to do with Mr. Moreno’s death.

Digging through Redweld folders, she assembled her notes from the assignments she’d had with Mr. Moreno over the past few months. She’d saved everything. As an interpreter, she worked with the police and court system from time to time. She had gotten into the habit of being very conscientious about retaining all her files in such cases because a mistaken phrasing of a detective’s question or a suspect’s answer could easily result in an innocent man being convicted or a guilty one going free. This diligence carried over into her commercial interpreting assignments too.

The police would get nearly a thousand pages of translated material by and about the late Mr. Moreno.