DCI John Luther and DSU Martin Schenk in “Unfinished Business”

DCI John Luther

Well, there's this thing. Cotard's syndrome, okay? It's a delusional mental illness and the patient thinks that he's dead and decomposing.

DSU Martin Schenk

And the cannibalism? That's a symptom?

DCI John Luther

No, not usually. I mean, I'm making a... a leap. Well, it's a small leap... it's more of a hop, really.