Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor enters forbidden attic space
S19E17
·
Black Orchid Part 1
To
Doctor discovers murdered scientist in cupboard
S19E17
·
Black Orchid Part 1
Why These Connect
The narrative assertion
"The Doctor's discovery of the secret staircase upwards is part of his growing exploration of the house's hidden spaces, leading him through books and clues to the final horrific discovery of the corpse."
About Causal Connections
A directly causes B. The first event sets forces in motion that produce the second. These are the load-bearing connections of plot—remove one and the story structure collapses.