My own theories (for what it's worth):
1. The killer was known to Audrey.
2. The killer was well aware of how to meet up with AG (in the garage).
3. The killer had been to her house many times previously.
4. The killer is extremely inteligent AND cunning.
5. The killer is right in front of our noses.....walking around daily as if nothing has happened.
6. The killer is respectable - the wife, the kids, the house, the job, from a good family......you know, "the guy next door" type.
Did any of that make sense?
:waitasec:
Yes it makes sense. But was is the motive in your opinion (I mean even guessing) ?
Also did you mean literally they have this devil may care insouciance or do you think they could have guilt?