She must figure out a way to rescue the person ahead of time.
However, to rescue someone, you first need to know where they are?
Even Faye couldn't find the person, indicating how well Zion Caldwell hid them with premeditation.
Tessa Caldwell drew a map with annotations of the Caldwell Residence, Sterling Residence, Zion Caldwell's workplace, his and Lillian Sterling's newlywed villa, and his frequented places.
He locked the person up, so there's no way he wouldn't pay attention to them.
So, by examining these locations, one can see which other places Zion Caldwell frequents, as those are highly possible locations for hiding the father.
But how can she know Zion Caldwell's whereabouts?
She recalled the bug she got from Nolan Ford that she hadn't returned; it could come in handy now, just needing a way to place it on Zion Caldwell.
And she needed to have it on him at all times to monitor his whereabouts?
She thought of Zion Caldwell's briefcase.
