This is Half-Life 2: Episode 3.
After eons of Vaporware Valve just hands the wheel over to these developers and gives them the twisted approval to construct the long-awaited Half-Life 3.And they failed.
Miserably.
Adam's surname is Freeman.
Given that Adam's surname is never revealed, it (with little probability, but still) might be the same as Gordon's. In that case, since Mitchell was hunting the wrong person all along, Adam having the Freeman last name would cast a Double-Meaning Title.