Corpsecage Island

A tiny island that is said to have been part of all the Fallen Cities to date, except for London. As such, it's home to a remarkable amount of ruins. It's also home to an old, nearly-abandoned prison with only one inmate (see below).

London's most Watchful visit and explore as part of the Dilmun Club's scientific expeditions. Also,

those who seek their Heart's Desire...
...stop by to locate the deviless Virginia's former lover, a one-time prince of Hell, who is imprisoned on the island.