It's Bering and Wells set in 1930s New York City. Swing is king and Count Basie has just taken up residence in the city.

Earth, missing for centuries thanks to war and neglect has suddenly resurfaced. Has the long lost home planet been found or is someone playing the ultimate power game? It's up to a dedicated team of Officers to find the truth at the heart of the story. (A repost from AO3 in case you missed it)