Alright: you're not here, looking at the Innocent in Death page, if you haven't already read several (if not all) of the previous books in this series.
To get a few things out of the way, the book was certainly up to par - it's funny, not as funny as other books, but clever, and the murder mystery has a fantastic choice in murderer. Side characters are minimal, due to the overwhelming amount of Eve and Roarke ANGST... bringing me to the point.
As a huge fan, this book was extremely painful to read. Not because it was bad, but because Eve emotionally suffers a great deal. Murder mystery aside, the most important part of the novel revolves around Eve and her pain in dealing with one of Roarke's previous lovers, one he didn't leave (because, horribly enough, *she* left him), the woman's clear desire to win Roarke back, and Roarke's own obliviousness about it.
It's a testament to Roberts, who isn't always this good, that when Eve suffers, oh, the reader suffers. There's a particular line where Eve's unease is described as "there was still that small, cold place inside her where the heat hadn't quite reached". Well, reading this book is exactly like that: every mistake Roarke makes, every move the other woman successfully completes, every bit of emotion that Eve bleeds - it's very, very painful, and moreso if you're a fan of Eve and Roarke.
In my opinion, Roarke didn't suffer nearly enough, which is why this book gets four stars instead of five, because I was still left with a distinctly bitter taste in my mouth at the end. Not. Fair. He suffers perhaps one-tenth of what Eve did (and mostly a couple evenings of paranoia), and relationships aside, he really needed pain, if only to make me feel better.
My only guess as to why he doesn't suffer *nearly* enough Roberts has said that she writes the In Death books three at a time - in one big character arc - and since the next book, Creation in Death, has the killer stalking Eve, that should be where Roarke finally suffers. And after this book, he'd better.