Maybe we can help each other brainstorm for missions?

Here is what I've been cooking up, maybe the group can help me fill in the plot holes:

A missing persons case. 

One week ago a home was invaded. The couple who owned the home were found dead inside, obviously a homicide. Their 8 year old daughter is still missing. It is unknown if the girl is kidnapped, dead like her parents, or ran away and has managed to stay hidden. 

Why are the Titans called into this case? It is because both parents were Titans themselves, and so was their daughter. What is her power? She is [i]invisible[/i]. Tough to find, huh?

So that's the idea, but I have no idea what has spurned this kidnapping/murder scenario! Let's brainstorm.

Does anyone else have any ideas for missions? I'd be interested to hear them!