I love this show so far! Let’s see if we can work out what we know so far…
30 years ago an experiment of some sort split our world into 2 - World A and World B - which at that time were exactly identical.
Only a select group of people in both worlds know that parallel worlds exist. The local police don’t know, and very few world leaders know. This means that it must be controlled by a single company.
My guess is this company exists to sell secrets discovered in the other world pertaining to scientific and technological discoveries into their own world. But what probably started off early on as mutually beneficial appears to have become antagonistic. No doubt Chekov’s Plague played a role.
On both sides the company seems to be made up of:
4th floor - the highest level executives. In both worlds the leadership is in chaos, and both sides have been infiltrated by moles.
3rd floor - strategy - we don’t know a lot about what this group does yet, but seems to be the most cosmopolitan positions. They likely figure out how to implement 4th floor directives with the other groups - and most likely create the folders used by Interface.
Interface - The lowest branch - they interact directly with a person on the other side reading coded phrases back and forth. They have no idea what they do, what they read, nor whom they’re interacting with.
Analysis - This group takes the coded phrases from Interface and converts to practical messages. They still don’t know what they do, and the work is split between incoming messages and outgoing messages so nobody can get a full picture.
Diplomacy - This group manages the delicate issues, and tries to get some of the big prizes of information if they can get it. Howard B officially works for Diplomacy.
Section 2- Spies - they build the network to get information from the other side. Howard B actually works here.
Housekeeping - They’re the ones that get their hands dirty to keep the secret from getting out.
In both worlds, Emily was working for housekeeping from the start and Howard started in interface. Approximately 28 years ago, they dated and married. One side had a wedding, one side eloped. Kids aside - Emily A kept her secret from Howard, and Howard seemed content enough in his life he never pushed himself to succeed - therefore he languished in Interface. Emily B told Howard B what she did which was the beginning of the end of their relationship. Howard B must have turned to work, women, and other vices to become the person he became.
Emily A became aware of something in this world that affects the other world and started writing letters to Howard B to work with him. This is what set this whole chain of events into motion. I have no idea where it’s going, but excited to see what’s next!