The cache is not hidden at the posted coordinates. Your journey will start at the posted coordinates, so go there first.
Once you are at the posted coordinates, follow the instructions and it will lead you to the geocache.
At the cache location, you have to solve a field puzzle to open the cache container and claim the find.
Difficulty:
* Multi: 3
* Field puzzle: 2
* Hide: 2
This cache requires you to download sound files that contain details needed to find this geocache. As the geocache owner, I ensure that these files are safe to download. It has not been checked by Geocaching HQ or by the reviewer. Download these sound files at your own risk.
Hi, I am Inspector Cachet and I am here to help you with your detective skills. 
This lesson is about doing surveillance. Sometimes, you have to follow a suspect and see where it leads you.
The info
I was following two suspicious persons who said they were planning to hide something. I was unable to follow them when they stepped into a car, heading north, but I was able to bug their car. Hopefully, the audio will be enough for you to find out where they were going.
The audio can be found by clicking the image below.
Check your solution
Important detail: Once you find the cache, you are looking for the information to open the container. The information is not on this page and can only be gained once you find the cache.