Victoria and Albert rule over a steam-powered British Empire that spans two worlds. Thanks to the portal known as the Rabbit Hole, a train ride away from London lies the Grosvenor Land, a new world of fertile plains, towering mountains, giant insects, and Babylonians with weird science zombies. Seems they got there first, three thousand years ago, and they're not exactly the welcoming sort. The Saurid tribes, lizard-like folk who ride theropods and pteranodons, complicate matters further. Back home on Earth, clockwork engineering has brought mechanical computing to the world, and micro-steam engines drive airships through the sky.