Victorian gothic game setting where the city of London is stolen into a cavern underground in which the rules of reality, like death being final, aren't quite as firm.
It's browser based and time gated. Sort of a slow burn thing you play a couple times a day. If you end up loving the setting, like I do, you'll be playing it for years. I think they have over 4.5 million words in there now.
It's free to play and all major storylines can be completed without spending anything. But I do find the subscription worth the money for the monthly stories.