Isn’t that the basic premise of fiction? I spend all of my days writing about people who don’t do the things I say and certainly aren’t in the places I mention. Usually they aren’t even real people. In fact I am a great big “Liar liar pants on fire” most of the time.
The funny thing is that amongst all the fibs, of which there are many, the thing I am searching for is the truth. The truth of what it means to be human. The truth and mechanics of relationships. To engage a reader in a story you have to find the spark of recognition, the place where a reader realises yes I know this, I have lived this, this man is like me.
In order to get to that place your writing has to remain true to your character. Are you trying to make a person behave in a way they simply wouldn’t? Does it ring true? You see people really don’t step outside their normal range of behaviour unless they are placed in extreme circumstances and even then it is unusual.
So figure out what your character’s usual reactions would be and then you will know if you step outside them. If you are going there, do it with purpose and conviction. There are times when you can use this fact to advantage but it must be with a character your audience knows very well and I think possibly several books into a series just to shake up the pace. Part of the truth behind people is that we do things for certain reasons; sometimes we don’t know the reason, sometimes we have some insight. We are complicated and understanding and using complicated characters to get to the truth is just about the highest goal of literary fiction.
So Lie to me, I want to know the truth.