It helps to know some of the background I think, wiltingfast. But the story itself does pretty much stand alone, as well as the seventh book in a series with the same characters can.
I promise I have done other things today, but this one was a surprisingly quick read:
Book 77 She's Never Coming Back by Hans Koppel
Ylva, a wife and mother, disappears one evening after leaving her colleagues to head home. Her husband isn't worried to begin with, assuming she has gone out for an after-work drink, but when she fails to return he calls the police. With no sign of her and the knowledge that she had had an affair the previous year, the police decide Mike is the number one suspect.
But Ylva is actually being held captive and repeatedly beaten and raped in the cellar of the house opposite her home. A camera has been rigged up so she can see her house and watch the comings and goings of her family.
I have a feeling I have read this before, or something quite similar. It's not terribly deep or anything, and while Ylva's situation is certainly horrific the book as a whole doesn't feel like it has a sense of tension. The story alternates between Ylva and her relationship with her captors, Mike and their daughter Sanna as they come to terms with their loss and start to move on in their lives, and two former school mates of Ylva's who start wondering about what has happened to the gang that had terrorised their fellow pupils twenty years before.