What's it about? Er. Hm. I'm about halfway and mildly confused (because I'm just not very comic-book-literate). But our hero (starts with "h"), Nelson, sums it up this way:
A few day ago I was just some guy. I'm still just some guy. Some guy working with his best friend's murderer to rescue an old lady superhero. To fight a supervillain and an angry void. And I am just some guy and I am terrified.
— from Dial H, Volume 1: Into You, by China Miéville.