The episode weaves together three major narrative threads that eventually collide in a tense standoff:
Morse is approached by his former Oxford tutor, Dr. Felix Lorimer, to investigate Paul Marlock, a man involved with Lorimer's estranged wife, Nina. Morse soon discovers that Marlock is also secretly seeing Joan Thursday. Endeavour - Season 3Eps4
"Coda" is heavy with symbolism and foreshadowing for fans of the original Inspector Morse series: The episode weaves together three major narrative threads