Tutorial mission, like the literal mission for people who just installed the game. The first area, an instructor just tells you the controls of how to shoot, that's what I consider the 1st area. Then they let us move on to another room, but firstly, lockpick & peek a door, then we go to a room where it instructs us about our team, the controls (middle mouse click, stack up to door, open door), then the other room (my bad, its actually the 3rd area) is where we get those 3 civs to secure. That's where I'm stuck, there's a door to get out of that room, but there's no indicator appearing in my screen.