Plot issues

[Gary]

I had a couple of issues with this book. First how did the victim get past security and into the place where she was killed before the "disturbance" which broke down the barriers. It doesn't seem like there would have been time afterwards.
The second issue is that after it was discovered the victim was from Australia, why didn't the police investigate her past in that country. This was written a bit before the internet age, but I am sure there is some way this could have been done quickly by telex.