Save for Phantom Man, earths mightiest super team, Front Line is still missing.

But, when Delta Squad races to answer a distress call from the Front Line skyscraper headquarters,  Mercy, Iota, and Chiller might find something far darker than a grieving hero. 
Is Delta Squad racing to their certain doom ? 
Who could be haunting the halls ?
Who let it in ? 

The tower of justice becomes a tower of paralyzing fear, as a grotesque mystery awaits the rookie heroes in their most spine-chilling mission yet.