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Are you sure this was a work of static literature? The text having only one side of the interrogation sounds very much like Andrew Plotkin's Interactive Fiction work Spider And Web.
This is an interesting game! I doubt this work was interactive though — you'd think the (older) lecturer would have said "the player" or "you/your" at some point, which would have immediately suggested a game. I'm pretty sure he referred to the characters as "men," whereas as far as I can tell this game doesn't specify the player character's gender. And I'm still fairly sure the setting was more realistic, and that the silent character was completely absent from the text — it sounded like the text was essentially a fictional transcript (i.e. strictly spoken dialogue) with one man's lines completely removed.
"If it ain't broke, don't fix it. And even if it is broke, just ignore it and maybe it'll be sort of OK — like the environment."

A novel or novella written in the first person, entirely as one half of an interrogation. There are only two characters, both men, and the novel consists of everything one of the men says, and nothing of what the other says. As the interrogation progresses, the reader infers the unheard man's reactions and responses based on what the voiced character says.
I heard about this book through part of a lecture that was broadcast on TV Ontario last year. I think the book is set in the Middle East or in some other conflict zone. The original language might not be English. It sounds very intriguing... has anyone heard of it?
Edited by Embryon