Late in the life of "Star Trek: Enterprise", the writers came up with three fabulous and exciting episodes involving the Romulans trying to destabilize the quadrant and prevent alliances between the Andorians and Tellurites. However, Enterprise is able to determine that some sort of drone is sowing discord--as it can imitate other ships and the recent attacks on an Andorian ship was NOT done by the Tellurites but this drone!
This particular episode brings the crew to a remote frozen location to look for any of the Aenar--a subspecies of Andorians who apparently are the ones piloting the evil drone for the Romulans. It's odd, as the Aenar are a peaceful, blind race and you wonder why any of them would kill for these Romulans.
Overall, this is a fine conclusion to the trilogy. It's well written, exciting and well worth seeing. Plus, I like ANY show featuring Shran!