A deadly, unstable shooter. A trap Malcolm and Seong-Jae can't escape.

And more than one life on the line as they find themselves facing down one of the Golden Ratio Killer's proxies in a high-stakes hostage situation that could ramp up the serial murderer's mathematical body counts exponentially.

And if Malcolm and Seong-Jae aren't careful, they'll be among the tally.

While back home, Huang's life hangs in the balance—and Anjulie walks a thin line between justice and deception.

Everything's spiraling out of control. And the more they fight to survive, the deeper they sink into a twisted game governed by not one, but two minds.

With Sila and the Golden Ratio Killer as the players . . . Will our heroes end up as nothing more than pawns?

Contains mature themes.