Speculation on the Identity of the Killer (Major S03 Spoilers)
I think it is Gustav, the guy who was in foster care with Anneka, and who stayed in touch with her
until she got married. I also think he is the third (and last) "kill brother." At this point (up to the end of
E08), we have not been shown or told anything that connects him to the crimes, other than his
history of being in the same foster home with Anneka (and probably Emil). However, I find it
difficult to believe that the series writer would bother to introduce a new character for the sole
purpose of telling Henrik and Saga a lot of things they already knew about Anneka, and life in the
foster home that they shared. I expect that the character will be used again in a big way.
I'm not really sure if Anneka had any role in the murders. It looked very likely that Emil was
held and tortured at her home, but that does not necessarily tie her to the rest of the killings.
At any rate, Anneka's role is not important anymore as she is very likely resting in a shallow
grave somewhere courtesy of Klaus, and the killer is, quite obviously, still at large. If it is Gustav,
as I am speculating, his connections to the foster parents, the ex-social worker, and the teacher
are obvious. However, his motivation for killing the first victim and Hans are not clear at this time. Even
more puzzling is his grudge against Freddie. It looks like he wants to take the baby as soon as Jeanette
has given birth, denying Freddie the one thing he wants most out of life. I doubt that he will kill
the child, but I can see him putting it into foster care thereby denying Freddie any information
on the fate of his baby. As for Emil, I suspect that he was kidnapped and released so that
he would lead the police to Anneka's house where they would find a mountain of evidence connecting
her to at least one crime. It is probable that Gustav (if he is the killer) was not aware that Anneka was already
dead. There are still a ton of loose ends to be tied up in the last two episodes, and it will be interesting
to see how many of them are resolved, and how many will be left as cliffhangers to be dealt with in
a S04.