Plot lines for 4th season

I think that there will be a 4th season because of these points:

1. I'm not sure that Saga's mother entered her apartment that day. After all, I don't think Saga would be so careless with her own notebook, up to the point of getting it unlocked - BTW, most notebooks lock themselves up once you close the lid. And Saga herself noticed that someone had been there, previously - there is even a zoom on Saga's hands which showing this.

2. Although the internal affairs investigator does not know, we have been let know that Saga went really to the cemetery that night, and waited for a meeting which never took place. And in the end, the lack of this alibi is one of the elements used to put her under investigation.

3. The goofiness of Rasmus Larsson is more and more suspicious to me. First, he almost compromised the case at season #2; then in season #3 he didn't do anything to stop Freddie when he went after the baby; and then, when he finally found Freddie's chopper, he left the killer run out. I can't believe how someone can be so dumb; unless all of this dumbness has actually another reason, of course.

4. The mysterious killer at the end of season #2. Had he reached his objective, that would be a big blow on Saga's and Martin's careers, and the collateral damage would be too big even for Hans and Lillian to handle.

So, my theory is like this: I think that that whoever is responsible for:

* Alice's death, confirmed by the end of season #3
* The kidnapping of Hendrik's two girls, also told on season #3
* Framing Martin in the end of season #2 by the alleged poisoning of Jens
* Killing Bodil, also at the end of season #2

This guy/gal should be the SAME person, somebody which wanted to to great harm to Saga, Henrik, Martin, Hans and Lillian. What other secrets these characters must hide in their past life?...