Mary Connealy - The Reluctant Warrior High Sierra Sweethearts, Book 3

Union army officer Cameron Scott is used to being obeyed, but nothing about this journey to Lake Tahoe has gone as expected. He's come to fetch his daughter and nephew and seek revenge on the people who killed his brother. Instead he finds himself trapped by a blizzard with two children who are terrified of him and stubborn but beautiful Gwen Harkness, who he worries may be trying to keep the children. When danger descends on the cabin where they're huddled, Cam is hurt trying to protect everyone and now finds Gwen caring for him, too. He soon realizes why the kids love her so much.