I think it's more likely Tim is nice to chris because he at least thinks Chris saw something incriminating.
Chris saying about a "personal event" causing him to spiral, suggests to me he was a victim of csa, rather than a perpetrator or even a colluder.
The trophies may not be from old ladies - as in he molested them when they were old - but ladies who were young at the time but eg the underwear belongs to a young girl/woman from a long time ago when there was less choice in underwear.
Not sure your ages but I'm 46 and certainly when I was late teens/20's underwear options were pretty basic.
Thinking the underwear probably not hers but the necklace (hairs - dna?) I think will turn out to be hers.
Previous series there were twists BUT they didn't do that thing of cheating the viewer by having it turn out to be someone COMPLETELY from left field (am I right in remembering at this point that the twist in s1 related to it being a racially motivated murder and the murderer seemingly last of the suspects you would think of as racist?)
Dad is still alive? I missed that. I don't think it's the dad.
The ex cop - I think it's possible he messed up but I don't think he was involved in the murder or planting evidence - more likely missing evidence, dismissing a witness statement or something.
"I really hope her dads horrible gold digging girlfriend gets exposed before her dad buys a place with her." Be good wouldn't it? He was REALLY annoying me with the patronising shit though! So might be satisfying to see him get (slightly) shafted! How is she "poor" when she's an unmarried, child free career woman though? What else did I miss? (I can see me having to watch the lot again!)