At first, reading The Murder Next Door felt like reading the nth book in an ongoing series. There were references to previous investigations, and bits of one of the protagonists’ past were peeping through, and it just felt like there was a whole previous book or even series being referenced. I knew it was the author’s debut, though, from other reviews, so I stuck with it and can confirm that the information you need is all contained within this book, that you don’t need to know about the previous investigations (aside from that they were ill-received by the local police), and that the characters and their motivations all fully make sense by the end.
The story itself is not so unique: the couple next door have always seemed a little haughty and aloof, but beneath the surface, the husband was abusive and unfaithful, and the wife was terrified and fed up. Louisa and Ada become involved when the husband suddenly dies, and it’s clear it was poison: Ada saw the wife fleeing with her young son, and is haunted by another woman who was once arrested for murder.
Where it becomes a little less typical is the fact that Ada and Louisa are a couple, with Ada acting as Louisa’s ‘companion’ in order to hide the truth of their relationship. What’s more, Louisa is actually asexual (though she doesn’t have that word for it), and her relationship with Ada is a balancing act of trying to read cues she doesn’t understand, and trying to ensure the relationship is also satisfying for Ada. That aspect of the book was handled pretty well: that navigation between them rings true.
Overall, it was a fairly enjoyable story once I got into it and felt sure that all the pieces would be present in the same book (and that I wouldn’t have to find some other book to figure out why Ada was so affected by the case). I did find the characters a little… wooden, I suppose, in some ways? There were some scenes where things definitely rang true, and then others where it felt that the characters were arguing or agreeing solely because that’s what the plot needed in order to proceed. Sometimes it felt like a bit of a shortcut, I suppose.
So I guess the upshot is that it was enjoyable, just not brilliant.