Yes, Divided in Death is different from the other books in the series. You have your typical Eve driven investigation of murder with someone she or Roarke knows and need to prove innocent. You've got your people who misunderstand Eve's ways which hurts her but she remains silent. McNab, Peabody, Mavis, Feeney and Trueheart are all there, which makes for a nice continuity.
This time we've got spies and government intrigue at the heart of the murder case. But Divided is more personal than the other books. Eve and Roarke have always had heated arguments but have been solid with their marriage because of their love for each other. This time, they each struggle with something inherent to their make up and it's not so easily moved past.
A great part of the book, contrasted with the others, Eve and Roarke cannot find their way to each other, they are estranged by their different reactions to some information that comes to light about Eve's past. It's this struggle which makes the heart of the book so compelling because you want them to make it, they are the other half of the other but at the same time, some things can't just be moved past.
I won't give spoilers but I found this intensely personal approach a nice refreshing change from the other books and I thought Robb wrote it well and threaded it into the mystery in such a way that you don't get bored with one or the other.
There were a few scenes in the book where I must admit I did get a bit weepy. Eve, without Roarke's strength, without his love and support is very empty and sad and it reminds you of who she was in Naked In Death and how far she's come.
A very worthy read for those who've followed the series and the growth of the characters and the marriage between these two unlikely lovers.