Finding a single assassin in a city of nine million people is daunting. Finding five is a nightmare.

Lower Manhattan: A sniper's bullet ends the life of a high-profile New Yorker. Five miles uptown, a second prominent victim has his throat slashed.

And that's only the beginning. A network of professional assassins is on the loose in New York City. Trained by the US military, they're on their own now, with a new unit called Kappa Omega Delta. Killers On Demand. NYPD Red detectives Kylie MacDonald and Zach Jordan are called in to hunt them down, but these mercenaries are as gifted in the art of escape as they are in snuffing out lives.

It's the biggest professional challenge the Red team has ever faced, and before it's over, both Kylie's and Zach's personal lives will change. Forever.