Dialogue is one of the trickiest aspects of writing a novel. The plain truth is that the dialogue we read in books is nothing like the dialogue we use when we actually speak and interact with other people. When we are face to face with someone, we use their facial expressions to interpret what they are saying. That feeds how we then respond.
That cannot happen in a book unless you actively make one
character—your POV character use others’ facial expressions as part of your
deductive plan.
As a writer, you should always be aware of people around you in public situations. Listen to their speech patterns. Listen to what I call the music of their sentences. You will find that someone who speaks in a Yorkshire accent will not speak the same song as someone from Norfolk, for example. Eavesdropping is an essential part of learning how to write effective dialogue.
The successful writer must pick this up and encompass it. One way to do this and I think it is especially important in the crime novel, is to know your characters inside out - and this includes their speech patterns and the vocabulary they use. For example, your villain, Hugo, because of his background/upbringing/goals, will have different patterns and vocabulary from Inspector Daniels with his upbringing etc.
What does Hugo’s
voice sound like? Is it a snide voice? How does his view of the world and his
place in it affect his speech patterns?
Your dialogue
should reveal something about the character who is speaking. If it is a
stand-off between your protagonist and your antagonist, they may have different
but related goals. Hugo will want to avoid arrest. Daniels will work towards
solving the crime and arresting Hugo. That will affect how they interact with each other.
Now write the scene. It doesn't have to be long. Remember
to make your dialogue individual to each man so that the reader does not need to read many
“he said/she said”. The aim of this exercise is for you to make it clear to the
reader who is speaking.
If the dialogue is a long one, you can have one character say the other character’s name. For example Daniels could say:
' Hugo, we checked with your office. Your car was not in its parking space for 45 minutes at the time your wife was murdered.'
'Oh, for heaven's sake, this is stupid. I've just lost my wife and you're wittering on about where I parked my car. I don't suppose you have a specific time of death yet. You see, I do know about how tricky TOD is for pathologists. I'm not the moron you seem to think I am.'
'We have witnesses who are adamant your car was not in its space. Why?'
'If you must know, inspector, I parked at the other end of the car park this morning under a tree out of the sun. If you had a Merc., you'd do the same.'
'Then where were you? Your secretary couldn't find you.'
Daniels is keeping his sentences short and succinct while baiting them to make Hugo lose his cool. Hugo's sentences are longer with what he thinks are appropriately condescending comments, trying to undermine Daniels, make him believe Hugo is superior, and must be treated with more respect. It isn't working. Or, if it does work, you have to find a way to make Daniels realise he has been manipulated and formulate a plan for the next time he interviews Hugo.
Over to you. You aren't trying to write a crime novel here, just a short scene, so there is absolutely no pressure, but a lot of fun to be had.