The "buried secret" the Captain is so desperate to protect turns out to be a metal box containing blueprints and a letter related to "Project William". While some fans theorized it was a love letter, it served as a powerful "red herring" for the Captain’s deeper, private feelings. Why Fans Love It Redding Weddy | Ghosts Wiki
Lady Fanny becomes unexpectedly engrossed in Lady Chatterley's Lover after spotting Kitty reading it. The Heart of the Episode: The Captain & Havers Redding Weddy
The scene where Havers leaves for frontline service in North Africa is heartbreaking. The Captain is left behind, saluting his friend (and implied love interest) from the gates. The "buried secret" the Captain is so desperate