This book caught my eye at the library and I remembered seeing it mentioned on Goodreads, but couldn't remember why I didn't add it to my shelf. I'm still not sure why that was, probably something I read in the reviews, but here's why I abandoned it:

It was way too gimicky. Every name was some play on the mythology of hell and evil. Probably this would appeal to the target audience (middle school), but for me, it was annoying.

The main characters were completely one-sided, at least to the point where I stopped. The older sister is completely evil; the younger brother is a clueless, goody-goody; the bully is stinky, dirty & gross.

Warning: this next bit is kind-of, sort-of a spoiler, but not really because it all occurs in the first 50 pages or so.

When the bully (who is actually responsible for the death of the siblings) shows up in Heck, I could already see the endless torment in store for the younger brother. No thanks. Don't want to sit through that.

Like I said, this would probably appeal to a younger audience. That is, after all, who it's written for. Unlike Harry Potter, Series of Unfortunate Events & various other series, this one doesn't appeal to a universal audience.