* Federation and Klingon Empire players get this story arc. Romulan players get it also, but the arc is called Freedom.*There are 11 total missions(episodes) in the Federation version of the Romulan Mystery story arc. Many of them are given to you by Admiral T'Nae (Starbase 39-Sierra) after you report the previous completed mission to them. There are 6 total missions(episodes) in the Klingon Empire version.
Most missions involve traveling to a part of space, doing battle with enemy ships in the area, then transporting to a location where you'll do some exploring and battling enemy personnel. Be sure to loot crates found in each area and to equip your mission reward gear and promotion skills as you get them.
If you get stuck during a mission, just click a mission title for a walkthrough:
You can check your progress from the in-game menu by pressing
and selecting Missions, then Mission Journal, then the Episodes tab, then select Romulan Mystery.
If you started as Federation, you may also get this while completing this arc: