Ascendance / John Birmingham.

There were too many of them. Lucille was nowhere Dave could see and only a faint mournful sigh reached him from where she lay ...It was time to die, the hero's journey over.' New York is on fire, the streets are overrun, and the Demon Horde is feasting. With the world's greatest city in chaos, all eyes are on Dave Hooper, the superhero destined to save mankind. But hero or not, Dave is just one man and he's short of allies. He soon finds himself relying on Karen Warat: art dealer and Russian deep cover agent. Smart, dangerous and armed with a magic sword, Dave knows not to trust her. He also knows that without her, New York will fall. While the United States military try desperately to hold off the Horde, Dave and Karen realise that the monsters have a powerful new weapon - one of their best warfare strategists is working for them. With the enemy using the military's own tactics against them, defeat seems imminent.