Whilst in rehab Luke tries to help another addict.
This episode focuses on the character of Luke and his time in a drug rehabilitation program and features a brilliant performance from Oliver Jackson-Cohen with excellent support from the other cast members.
I won't go in to plot details but theme of people being haunted by trauma runs strongly through the show and very much so in this episode as Luke's trauma literally follows him wherever he goes.
The parts of the plot set in the present are far more compelling than than the Hill House scenes which contain lots of horror movie style moments but don't reveal anything other than what image of childhood trauma Luke carries with him throughout life. This image is linked to a haunting opening monologue delivered by a blind Iraq veteran during a group session. Some of the scenes are almost up there with the substance abuse related dramatisations seen in The Wire and The Corner.
Visually it is as good as the first three episodes with atmospheric cinematography and superb editing, particularly during shifts between time periods. Some excellent transitions were achieved by sound-effects alone.
It finishes well, making you want to watch the next episode immediately (even if you do not have the time).