"Gunshots?" Harvey and the others turned white as ghosts.

"Who fired? We haven't even entered yet!" They quickly exchanged glances.

But a quick check confirmed everyone was still outside, including Vivian, who had been trailing behind them all along.

"Damn it! Did another group get here first? This just got messy—"

Nathaniel's expression hardened as he looked towards the upper floors of the building. The initial burst of three gunshots was followed by ...