Finally watched! still pissed off with the babysitter character - I can well believe a 16 year old would be that horny and stupid, but the character swings wildly from naive and hormonal, to suspicious, to knowing and even willingly complicit... it just doesn't work. The scene where he fed her a pack of lies (and based on a very thin pretext of English Irish rivalry - presumably some link to his English soldier father) was I think his weakest scene by a mile, just crap writing. I also thought him breaking into her hotel room to read her diary and leave a note, rather than kill her, feels gimmicky. Until this week, I thought his character was building amazingly into a total maniac, but now.
Presumably all he heard and read in her hotel room is going to be used in some humiliating campaign to discredit the police - the Monroe scandal is presumably going to break at some point. I'm starting to think that 'the fall' isn't necessarily going to be Spector's, or only his....
Otherwise the kiss with the pathologist (and that actress is shit, her voice and even her bloody outfits never change from character to character) made me groan, it was totally crass misogynist bollocks and I hated it. And though GA is mesmerisingly beautiful, thinking more broadly, WHY does the Stella character have to wiggle around in cripplingly tight leather skirts? Why can't she be a brilliant police officer and have crap hair and wear M&S trousers, for christ's sake? the other police officers are convincingly badly dressed 
I thought the most interesting bit of the episode was Rose on video, referencing what he was "doing" to her. I wonder.
Otherwise it's just stupidly elaborate. Was still scared shitless though 