I really enjoyed this. But that's not to say that I found it full of credibility. That a disbarred professional fighting to get her job back would do what Vera does is a step too far, especially in front of witnesses.
That apart, I enjoyed the present day and flashback format of the series. The person playing young Vera was excellent too.
The actor playing the putative adult Billy was less convincing although I'm going to put this down to bad directing. From episode five onwards, he'd obviously been told to look menacing and he did this by baring his teeth when smiling. It didn't work.
I didn't guess what had happened to Billy but I had realised what Tommy's fate was and who the perpetrator must have been.
In a highly regulated state like Sweden, it seemed odd to me how people's identities couldn't be established. Even odder, why not demand a DNA test immediately instead of acting on supposition and intuition?
I'm glad I saw this and it filled a few hours. It made my brain work and surprised me too.
Recommended.