The following is a viewing diary I wrote as I watched the show for the first time, pausing after each episode to collect my thoughts. As such, it is spoiler-free for upcoming episodes (although the comments section may not be).
The first episode of True Detective left me uncertain whether the show would go for mood and texture or character and plot, but "Seeing Things" definitely emphasizes the latter qualities. It is very investigation-oriented. We learn about the "ranch" where Dora Lange turned tricks before her murder. We also meet her drugged-up, mentally ill mother (Tess Harper) and in an episode full of creepy touches, the picture of Dora as a little girl surrounded by men in Klan regalia is one of the creepiest. (Turns out it's not Klan regalia - ed.) And through Dora's eerie sketchbook/diary we glimpse more details about the "Yellow King" who may have lured her into a pseudo-Christian cult, whose burnt-out church we discover near the end of the episode. This is one of the show's most memorable locales thus far, especially after Cohle's intuition leads to the discovery of a mural on its wall - featuring a naked woman crowned with antlers and crouched in a position similar to Dora's in that field.