The book is set in a world where vampires have taken over; like I Am Legend, only the vampires owe more to Dracula and other fictional vamps. It's a heroic tale, about how one man can light a spark that can, ultimately, lead to the vampires' defeat. Sure the man ends up becoming a sort of half-vampire--kind of like Blade, only with more vampiric weaknesses--but he's still a heroic man even then.
There's another great bit of dialog in the book:
"'Father Joe Cahill is back--and he's pissed.' I like that."
"It'll make a great bumper sticker"
It would make a great bumper sticker.
The book is great. It's got some great lines, some great adventure, some great characters, and it's pretty damn scary. Even if you don't like vampire books in general, or if you were turned of by the crappy movie, you should still buy this book. Midnight Mass gets five yo-yos from the Yoyogod.