Question:
What door? I started to ask, as Daniel took a perfectly ordinary looking chunk of brick wall and wrenched it aside to reveal a dark corridor beyond.

Does it follow that "Daniel didn't know where the door was."?
Answer:
no

Question:
Cornerstones 8 Critical Success Factors

Does it follow that "Critical success factors changing "?
Answer:
yes

Question:
A pair of binoculars will be particularly useful here, in order to appreciate the splendid detail of the carving on the soaring central tower dominating a whole complex of temples.

Does it follow that "There is much detail carving here on the central tower."?
Answer:
yes

Question:
The range of fashion boutiques around San Marco is small but select, with an emphasis on top-class shoes and other leather goods made in the Brenta area outside of Venice.

Does it follow that "You can buy top-class shoes in boutiques around San Marco."?
Answer:
yes