I bought this to get the Eve Dallas "Haunted in Death" novella, as its events were mentioned in passing in Born in Death. The theme of the collection is ghostly love stories: none of them is particularly ghostly.
I bought this to get the Eve Dallas "Eternity in Death" novella. The alleged theme of the collection is paranormal love stories. A more disturbing theme emerges from the later stories: being a successful business woman is not fulfilling; you need to give all that up for the love of a good man. Feugh. (Eve manages to have love and a high pressure career. Which certainly makes her more interesting to read about..)
Another one of these collections of four novellas, that I buy just for the Eve Dallas story. Here the link is really weak: they're all to do with "Suite 606", but there's no agreement on what Suite 606 is. However, there is also a more subtle link: in each of the first three stories there is some kind of random event that seems to be there just to add a little local colour, but each of these is actually a scene from the final story. Hmm.
Another in the themed collection of four novellas, that I buy just for the Eve Dallas story. Here the (again rather weak) link is about something or someone that is "lost": a murderer, a life, a daughter. The novella is a length that doesn't really work for me: too long to be a single "hook" short story, but not long enough to get the sub-plots and back-stories in a novel.
Another in the themed collection of four novellas, that I buy just for the Eve Dallas story. Here the (again rather weak) link is "the other side": mostly, but not always, ghosts.
A further entry in the themed collection of novellas that I buy just for the Eve Dallas story. Here the link is presumably "the unquiet", ghosts that cannot rest (for those stories that actually have ghosts).