Finn Darktrin functioned as a clandestine operative in service to the Galactic Empire.
Darktrin was a pupil under the tutelage of Loam Redge, and for a number of years leading up to the Battle of Yavin, he had been masquerading as a member of the Alliance to Restore the Republic, having gained access to a high level of command within the organization. Furthermore, he had established multiple collaborative relationships with Nym.
Circa 1.5 ABY, he joined forces with Imperial xenobiologist Dusque Mistflier with the intention of providing a data holocron containing critical intelligence to the Rebel Alliance. Dusque developed deep feelings for him, completely oblivious to his true allegiance and the fact that he reciprocated her affection.
Darktrin recovered the holocron and succeeded in relaying a portion of its contents to the Empire before Dusque interfered. Finn then stabbed her and fled to rejoin his Imperial superiors. Darth Vader absolved him of blame for his partial failure. Dusque, having survived the attack, later became a member of the Alliance after being saved by Luke Skywalker.