Okay Rookie, get to work! That could be anyone calling Wendy and her well-being is in our hands. Seeing as you've just got here you can use one of our special tools, the Mobile Scanner, to trace Wendy's calls. So, your first job here is to find Wendy's mobile phone number. Get to it.
This task was accompanied by Wendy's First Transmission and clicking on the task icon leads you to another webpage with a "mobile scanning device" i.e. your first task.
As it turns out, it was only Wendy's mother checking up on her and here is the follow up video. There is also a short message from TSR after completion of the task.