The episode is called Knives Out, a reference to the Daniel Craig movie than the Radiohead song I presume.
The knives also belong to the Swiss White House Executive Pastry Chef, Didier Gotthard (Bronson Pinchot.)
He seems to be the main suspect to detective consultant Cordelia Cupp. Gotthard is a person of interest but not necessarily the murderer.
Gotthard certainly came across the dead body of A. B. Wynter, even cleaned up the possible murder weapon. Yet he still not be the murderer as far as Cupp is concerned.
The third episode finally concentrated on one of the main suspects. How Cupp observed that Gotthard might have had something to hide much earlier on.
It might be that the rest of the series could follow a similar pattern. By now I felt the quirkiness of the show is not enough.
It feels stretched, a lot of it was filler which could had been done in the second episode.