There's got to be a Season 4
I enjoyed the first 3 series ,i thought it was great tv, season 3 threw me a little with the new character but it all pieced together in the end.
The ending though opens the door for even more, it would be good to see if Henrik ever finds out what happened on that day he went to work ( aside from the murder of his wife.... ) and the closure of the death of Saga's mum.......alongside any other cases the writers would like to throw in the mix.
It would be a shame , well not a shame because we've had 3 great series , but a shame nonetheless to not peruse the series further especially with such a strong foundation been built with the characters.