Two people get on a boat, only one of them returns and purposefully tries to sink his boat.

As murders go this one has a lot of circumstances that facilitate solution in spite of all the attempts at muddying the waters.

Yes, of course. And a type of boat that assures several pictures of the woman on board, sightings, etc.

I was more addressing the idea that you can't away with murder. Perhaps not in this case, but it obviously happens, and quite often.

Haha yes, it sounds so obvious when you put it like that. It's hard to believe that he went through this in his head and thought it was a good idea. How stupid does he think other people are?

If he was smart he would have driven his submarine to Russia and never come back.

Wikipedia (what it's worth) says 97,6 % clearance rate for murder in Germany (2008). With 662 murders (2011) this would mean ~16 murderers get away.

Clearance is not conviction.

And lack of clearance does not mean lack of guilt, more likely if there is no clearance it means that there is no case and most likely not murder.

You can use this as a proxy for the police 'solving' crimes but it would be much better to use the actual rate at which murderers are convicted because the police do not always get it right and do not always manage to establish guilt of the defendant beyond reasonable doubt.

Yes. There are many differences, depending on culture, police set up etc. The high conviction rate of nearly 100% in Japan due to the way police/justice works there comes to mind. Only could find conviction rate for all crimes (not only murder and manslaughter) which is around 80% in Germany.

Denmark, the place in question, seems to be at about 5 of 50, or 10% unsolved. http://aftertheamericancentury.blogspot.com/2017/01/5-murder...

I believe the UK is higher.