You may know Fallen London as the predecessor to Sunless Sea, Failbetter's narrative-heavy roguelike.
According to Eurogamer, Fallen London will be coming to iOS later this year, and possibly Android after that.
If you're unfamiliar, Fallen London is an in-browser text-based adventure with over 1.2 million words and an open-ended story, set in a Gothic underworld.
Fallen London's mobile port will remain free, with added in-app purchases.
It'll also be cross-platform so you can pick up your progress on the computer or your mobile device.