This is one of Hill's shorter novels. About three quarters into the read, I couldn't help feeling a tad short-changed because I suspect the entire purpose of this novel was to recycle many plot points already visited in some of Hill's earlier works, possibly with the intent of attracting a new/younger audience who prefers shorter novels. This didn't make it a bad read, just repetitive. Long-time readers of Hill will recognize a lot of recycled ideas and situations.
"Dark Viking" introduced an interesting mix of characters. Rita Sawyer, AKA "Spider," is a former stunt woman training for WEALs. Strong and athletic, laid-back and easygoing, Rita's life seems to be falling into place after nursing her terminally ill mother through her final year. A bizarre accident during a challenging military training exercise transports her through time into the keep of Steven of Norstead, younger brother to Thorfinn, a Viking/SEAL who traveled into the future. Steven's had the blues ever since his big brother's mysterious disappearance and several local concerned witches took it upon themselves to cast a spell to restore "light" to the good jarl's dark mood. Is Rita the answer to their prayers?
The romance and sexual tension broils between Steven and Rita. I really liked them together, and I felt Hill, as always, did a great job working the historical time/culture clashes into the storytelling. Yes, she takes some liberties, but it's for the book's own good. I was also very excited by the prospect of a heroine like Rita adjusting to 9th Century life in a sexist society. That quickly got old. Apart from a few early action scenes, Rita doesn't fare all that well. So much for all the high-tech military training. As far as Steven and his buds are concerned, she's just another woman, and a somewhat annoying one at that.
Lots of bondage and domination permeate this read. Rita is confined in a cage. At one point Steven forces her to wear a slave collar and leads her around by an attached chain. This would not have bothered me so much if Rita had been okay with it, but she is not. I found it offensive when Steven utilizes sexual blackmail to coerce Rita into his bed. Such lazy writing! I mean, surely Steven had the savvy, looks, and talent to seduce Rita without the force, threats, and bondage.
Despite these "lows," I still found the characters interesting and compelling. I kept waiting for Steven to experience some kind of epiphany, but he never does. I think this is the one Hill time travel romance I've read where I believe the couple won't make it in the long run, but reading their story was still pretty fun.