Fenna Brongaard is an agent with the DSIS.
The acronym is the English form of the agency's name: Danish Security and Intelligence Service. Its Danish name and acronym is the Politiets Efterretningstjeneste or PET. The agency focuses solely on national security with its stated purpose being to "prevent, investigate and counter operations and activities that pose or may pose a threat to the preservation of Denmark as a free, democratic and safe country". Further, "the primary duties of the PET are counter-terrorism, counter-extremism, counter-espionage and security."
Brongaard will become an operative with that organization as the series progresses. When we first meet her, however, she is a member of the Sirius Sledge Patrol (Slaedepatruljen Sirius) which "is an elite special forces unit within the Danish military with the primary mission of maintaining Danish sovereignty in Northeast Greenland".
She was 22 when she joined that very unusual and hazardous line of work, possibly the first woman to have made the very rigorous grade. As we catch up with her she is on her third rotation into the barely inhabited terrain where survival relied on your solo human partner, your sled dogs, and your own ingenuity and endurance. She asked for this assignment because of the challenge. "Competing in a biathlon is one thing, but I always wanted something more."
She will get more than the challenge when she is pushed from one harsh career into an even harsher one going up against agents from other countries far above the Arctic Circle where trust is harder to find than people. The dangers and suffering are made abundantly clear to her in her training, which is brutal in itself and had me wanting her to return to that facility later to get some much deserved revenge..
The tag line for this trilogy of adventures is "Run with Dogs. Fight Like Wolves". Brongaard has learned how to do both.