Three characters: one is a liar, the other two have to live with the consequences of those lies.
You may wish to think about the following possibilities:
- Does the liar have a great influence on the other two, and if so, how are you going to show this in your writing?
- Do the two secondary characters have the same reaction to the lies?
- Are we thinking about a DoaS style relationship… or are we talking about a Chris Tarrant type thing?