Stevenson creates a sinister atmosphere using personification and metaphor. The fog “slept on the wing” above the “drowned city,” portraying London as lifeless and submerged under a suffocating force. The simile comparing the lamps to “carbuncles” is particularly disturbing – the image suggests not only dim, blood-red lights, but also illness and corruption. This reflects the novel’s Gothic tone and reinforces the theme of hidden evil beneath the surface of the city.