There are two Londons, the mundane "Front London" which is our world and then the more mysterious "Reverse London". Dragons are responsible for over 70% of deaths in the city, and only people from Reverse London can see them.
Burn the Witch is set in London, a city in which people are killed by dragons.
Dragons are responsible for 72% of all deaths in London. What's worse is that most people can't even see the beasts.