Naked in Death, Nora Roberts

Named by the social worker who rescued her as a child, Eve Dallas is now a New York police detective who lives for her job.  In over ten years on the force, she's seen it all - and knows her survival depends on her instincts.  But she's going against every warning telling her not to get involved with Roarke, a charismatic Irish billionaire - and a suspect in Eve's latest murder investigation.