Nikita Vasiliev studied for years to be where he is. The leading cancer research doctor in the world. He had been sent to study on an island off the coast of Russia, a freezing wasteland of solitude. The radioactivity of his studies were deemed too dangerous to be used on continental Russia, so he was sent here. Also, what better way to escape his (recently) ex-fiancé? Never mind the solitude of living on a freezing island working with radioactive chemicals. The only thing Nikita had to miss was his sister, Anastasia.
Anastasia Vasiliev worked hard. Harder than anyone she knew. But no one said it was going to be easy, being the prima ballerina of the Russian ballet. That job, of course, was merely a cover for her real job: she was a Russian operative. The ballerinas could enter and leave the country without much fanfare, travelled around Europe without people batting an eye, and were known for strength, elegance, and multilingualism. When she was sent to an island to check up on her brother, she didn't ask questions. She just did as she was told.
Levi Johnson knew he was the best. That's why the government paid for his West Point education and immediately hired him to work in a special operations team in the CIA. So naturally, when he was assigned to find and eliminate a Russian scientist supposed to be developing new forms of radioactive warfare, he jumped right on the case. All in the name of keeping America free. So no, when he discovered he was sent to kill a cancer researcher, he was not pleased.
All in all, it was going to be an interesting trip.