Causal
strong strength
Narrative Connection
How these two moments in the story relate
From
Doctor arrives at Cranleigh Hall unnoticed
S19E17
·
Black Orchid Part 1
To
Doctor enters forbidden attic space
S19E17
·
Black Orchid Part 1
Why These Connect
The narrative assertion
"The arrival of the Doctor and his companions at Cranleigh Hall—observed from above by Latoni—directly leads to the Doctor's covert investigation through the secret passage, as the house's mysterious atmosphere intrigues him."
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.