Cross Blackfriars Bridge at twilight and think Dementors drifting above the Thames

https://israelryhi299.yousher.com/where-to-buy-harry-potter-souvenirs-in-london-shop-at-king-s-cross-and-beyond

Cross Blackfriars Bridge at twilight and believe Dementors drifting above the Thames, as metropolis lighting flicker like lumos within the fog.