Yes, I thought surely that Angus's video camera, with its footage of him being attacked, was going to appear again somewhere as evidence of wrongdoing at the research institute, but tbh, that plotline didn't make a lot of sense to me. If Astrid was their sole patient for the illegal therapy, surely it makes no sense to have this giant hush hush laboratory behind ostentatiously locked gates, more or less saying 'Look at me, I've got something to hide' with sinister security guards (who are never seen or heard of again?) attacking elderly conspiracy theorists, when they could have had a discreet lab somewhere that no one would have noticed? And did we ever even find out whether Karin was Brutus and/or the one who shot Annie Bett? And the brother who shot his brother for sleeping with his fiancée at the start was completely unrelated to anything, and Anton Bergen just randomly confided in Annie Bett about Astrid and the therapy.
Final impressions -- Ian Bett is not exactly father of the year, and I'm not convinced Annie was mum of the year either, if she brought a nine-year-old to pick up a virtual stranger at a shady research facility and then freaked out enough to take him off to a half-renovated croft to sleep in a bath with a gun in her bag, rather than go to the police? I mean, you'd expect a former spy to have better risk assessment, to put it mildly.
Still, at least Tosh has a new friend. And Ruth's brother got one of those attractively-sited Hollywood facial cuts that enhance the cheekbones.