What investigators hide: dialogue as a window into hidden motives

When I write scenes between detectives, I treat conversation the way a barrister treats cross-examination: every sentence is offered, and every silence is withheld. The exchange itself becomes the crime scene, with motives concealed just beneath the rhythm of questions and replies. In a country as expansive as Australia, where a case might stretch from a suburban cul-de-sac in the Hills District to a windswept patrol car somewhere along the Nullarbor, investigators rarely share a single office or even a single state of mind. Their geography, and the friction between them, is something I lean on heavily.

For readers who follow my Thorkild Aske novels, this matters because the series explores people who work alongside each other yet keep their real loyalties hidden. Dialogue carries that tension. I have written elsewhere about my approach to switching points of view in certain scenes, and the technique I describe there feeds directly into how I shape what investigators say to one another, and what they deliberately choose not to say.

The interview room as a chessboard

An interrogation is rarely as confrontational as film makes it look. In my experience, the most telling exchanges happen in the gaps between formal questions, when an investigator offers a coffee, comments on the weather, or mentions a detail that should not yet be public. I use these moments to seed hidden agendas. A detective who casually mentions a colleague's holiday in Noosa at the start of a session may be laying groundwork for an alibi, or quietly signalling that they have already searched the suspect's inner circle.

The trick is restraint. I avoid the temptation to make every line a clue. Real conversations in an NSW interview suite drift, just as they do in a Brisbane watchhouse or a Fremantle station house. The reader stays alert because the prose stays calm. When one investigator finally pushes, the shift in cadence does the heavy lifting on its own.

What characters deliberately omit

One of the cheapest ways to show a hidden agenda is to have a character answer a question without actually answering it. In the Aske books, I often give a detective a polite, almost bureaucratic response that papers over the real point. The reader, of course, picks up on the evasion long before the plot does. I learned early on that Australian investigators themselves are trained to listen for exactly this kind of non-answer, and I borrow that skill when I draft.

A useful exercise comes from listening to how people really talk at work. Drop into a Centrelink office in Parramatta or a hospital cafeteria in Geelong, and you will hear professionals manage awkward truths with tidy little hesitations and softening phrases. Most of us do it every day. Writing it well on the page means trusting the reader to hear the song beneath the words, rather than underlining it for them.

Reading the silences between turns

A line of dialogue lives inside the silence around it. When I draft an investigator's reply, I usually think first about what they are choosing not to say, and only then about what reaches the page. Two characters sitting in a parked car at Coogee Beach at dawn can talk for three paragraphs and still be holding the entire conversation in what's left unsaid. The agenda hides in the turns they decline to take, not in the lines they deliver.

This is also where I find Australian slang so useful in moderation. A well-placed "yeah, but anyway" can signal that a character is steering away from a topic they are uncomfortable with. A clipped "she'll be right" can mean either genuine reassurance or a deliberate wall. Readers pick up these cues, sometimes unconsciously, and they shape their trust in each character accordingly.

Letting tension build through turn-taking

Rhythm matters as much as content. I often structure a dialogue scene so that the investigator with a hidden agenda speaks in shorter, more controlled bursts, while the one in the dark asks long, slightly rambling questions. The contrast does the work. The reader senses who holds information and who is reaching for it, even before a single fact changes hands.

Setting helps anchor this rhythm. A conversation on a sun-bleached veranda in Broome, or in the cramped kiosk of a servo somewhere off the Barrier Highway, carries its own tempo. The Australian landscape gives me a metronome. Characters speak differently when the wind is coming off the Southern Ocean than they do in a fluorescent-lit incident room. That difference is itself an agenda, a way of marking who belongs and who doesn't.

Comparing my approaches to voices and viewpoints

Below is how I think about dialogue strategy across the main techniques I use. It is not a rulebook, more a checklist I keep tucked in the back of my notebook whenever I open a new scene between investigators.

Technique	What it reveals	Best used when	Risk
Direct accusation	Shifts blame onto a suspect or rival investigator	A character has run out of patience	Can feel melodramatic if used early
Polite evasion	Hidden loyalty or fear of consequence	An investigator wants to stall without confrontation	May confuse readers on a first pass
Loaded small talk	A hidden agenda is already in play	Two characters share a personal or regional background	Risks heavy-handed foreshadowing
Rapid turn-taking	Power imbalance between two officers	One party is interrogating, the other is defending	Can blur who holds what information
Anchored silence	A character has crossed a line they cannot uncross	After a confession or a betrayal	Requires careful surrounding prose to land

The shared thread across each row is that dialogue works hardest when the reader has more information than the listener on the page. That gap is where the hidden agenda lives, and where the next clue is hidden in plain sound.

The practical takeaway I keep returning to is simple. I draft both versions of each dialogue line, the one my investigator will speak and the one they bury, then I keep only the buried version if the scene still works without it. That single move, more than any procedural beat, is what turns a routine case into a story with hidden teeth, and it is the move readers in Australia, the UK, and Scandinavia have written back to me about most often.