Match Grade: Assassins by G.B. Gordon

SOME MATCHES SPARK AN INFERNO
Eirik Haldurson is a hitman. Kidnapped at age five and cruelly trained by his captor, he is today one of the most sought-after contract killers alive. Emotional distance from his targets, brutally beaten into him until it became second nature, is now the only way he can function. Lately though, that distance has started to elude him.
And when a Colombian drug cartel contracts Eirik to take out ex-soldier-turned-vigilante, Matt Moreno, distance is suddenly as close as heat to fire. And all hell breaks loose.