His Dakota Captive (Harlequin Historical #1007) Book

[It's not really about the heroine being a captive in this book,as in the blurb. Sky just took her away for a bit to talk to her. It is about how she was changed by her kidnapping and marriage to Eagle Dancer, as a child and Sky's former life with the Lakota. It has been a few weeks since I read High Plains Bride, but I thought Lucie was closer to 15 when she was rescued in that book, but in this sequel, it said she was still 13 when rescued. This story picks up 20 years later. I did feel kind of bad for Eagle Dancer, who was still in love with her. I hoped they would get more closure and talk it out more, but it was handled well enough. (hide spoiler)]