FF Falling Into Fire by HollyAnne Weaver

Kathleen Pope is a firefighter who watches Bella Ward, a young business woman new to the land of the frozen north, trip and fall on early winter ice. What starts out as just helping out another person in need, turns quickly into sparks that fly... In both directions. Neither is sure about the others' inclinations or intentions at first, and both are apprehensive, but move slowly toward each other, neither wanting to pass up what could be the chance of a lifetime.