Duel of the Damned - Shadow King Series, #1

Shane Ryan's ultimate battle is about to begin.In back alleys and hellholes across the world, ravaged souls and scarred warriors whisper of the Iron Tournament. A savage game of death, pitting living fighters against caged spirits, all for the amusement of a mysterious audience. But a new challenger is about to enter the ring-ghost hunter and retired Marine Shane Ryan. He's never backed down from a fight.
And he's not about to start now. When a mysterious invitation arrives on his doorstep, Shane finds himself swept into a world of underground death matches, supernatural gladiators, and tortured souls. And in this sadistic arena, there is only one rule: Winners live, and losers die.But Shane quickly discovers a sinister presence behind these dark, bloody battles. A ravenous force that feeds on death and suffering.
Can he defeat this supernatural enemy in mortal combat before it unleashes unthinkable carnage upon the world?Or will Shane have to back down from a fight for the very first time?