Who is Eve Dallas from Immortal in Death and what is their importance?

This is the main character in J.D. Robb's Immortal series of futuristic detective novels. She is tough, determined, independent, detail oriented, dedicated, and completely in love with her fiance, Roarke. She would prefer not to depend on anyone for anything, but through her love for Roarke, Eve discovers that caring for people is what comes naturally. She does not necessarily like it, but realizes that in giving you receive. Eve knows that she is a good cop, something that she takes pride in.