In "Full Dark House," Christopher Fowler illustrates the dangers of blackout conditions during wartime, emphasizing the tragic consequences of poor visibility. The narrative highlights a specific character who keeps his shirt-tail hanging out as a signal to drivers, symbolizing a desperate plea for safety. This practice reflects the grim reality of over four thousand fatalities resulting from accidents amid blackouts in the early months of the war.

The text further points out the irony of seeking safety through military service, suggesting that accepting an overseas assignment with the British Expeditionary Force may have been a more secure option than navigating the treacherous streets at home. This reveals the underlying tension faced by individuals during wartime, balancing the risks of everyday life against the perils of combat.