England, 1889.
Lady Jessica McAlpin is the commander of The Black Diamonds, the Great British Empire's covert monster-hunting division.
With her crew of criminals, misfits and desperadoes, Lady Jessica soars above the land in the airship HMS Zephyr, tracking down the diabolical foes of the Empire.
After the devastating events of Episode 5: The Bloody Tower, Jessica returns to the Zephyr. On arrival at the aerodrome, she finds everything has changed and that her life — and those of The Black Diamonds — will never be the same again.
Heart of Darkness is the thrilling conclusion of the first season of Lady Jessica, Monster Hunter. The Black Diamonds shall return in Season Two: Angels Amongst Us.