I loved the pilot, but I felt similiar about the followeing three episodes. "Threads" because of the numerous plot holes in the ep. I appreciate the episode more by now, because it basically established Elizabeth as a character, but the case is still a little bit meh to me. "Book of hours", while it had many good scenes (I liked the ending), was a little bit overdramatic, with the dog who wasn't simply sick but a war surviver to boot. Flip of the coin is special because of the meeting between Peter and Mozzie, but the case itself is somewhat meh, and they spend too much time recapping it during the ep.

The portrait was the episode which convinced me - still one of my favourite episodes, along with the Pilot, Free Fall, Hard Sell, Front Man, Out of the Box, Need to know, Point Blank and Countermeasures.