The End of the Line by David Nelson

SPFBO7

Two old World War 2 vets end up in the same hospital, suffering from unusual conditions. In another part of the hospital, a ghost is stalking the corridors. This ghost and the two vets have a past, as one of these men murdered him while he was performing a ritual that had cosmic implications. Now it's time to finish the ritual, and these two men, along with others, are transported back to a secluded beach in Asia, and surrounded by the enemy.