"The Terror" by Dan Simmons. I already watched the show and enjoyed it, so I picked up the book and am only a few chapters in, but I'm liking it a good bit. There seems to be a good bit of historical facts thrown in, which I personally enjoy.
For those unfamiliar, it is based on the real life Franklin Expedition that disappeared while searching for a way to traverse the Northwest Passage in the Canadian arctic. The story follows the known facts regarding the fates of the expedition crew members, but it tells a paranormal horror story to fill in the blanks.
I'm not sure if you are in the same boat, but I bought ARMA 2 and Operation Arrowhead many years back directly from the dev's website. I logged into their site about a year ago, copied the registration keys, pasted them into Steam, and was able to redeem it through Steam directly. If your games have CD keys, Steam can oftentimes accept those directly like you are entering a Steam product key. I think you put it into the field where you enter Steam gift cards and product keys.