seems to be several storylines going on -
Serial killer investigation, which has the same pattern as a previous case that AF worked on. So she is asked some questions about it and then asks to come back to work on it (as you do). She is obviously a bit of a loose cannon but brilliant...
Dodgy business dealings and family fighting which includes AF's estranged husband, who appears to be having an affair with the boss's daughter. However, looking at AF's face at the end of the episode maybe something else is going on in her house.
Young prostitute girl who steals from/beats up clients. No idea how this is connected.
And then there is the main question of how did AF end up in the bath with blood all over the place??