The Hazardous Measure of Love by Louise Allen

They are lovers separated by two hundred years. How is a happy ending possible when a killer stands in their path?

Once more the drifting threads of time send Cassie Lawrence back to Regency England and her true love, Lucian, Earl of Radcliffe. A murder has been committed almost next door to Luc’s London home and Adrien Prescott, a good friend, and his entire family are prime suspects. But a mysterious killer is not all that is on Cassie’s mind: how can she ever find happiness, let alone start a family, with a man out of her own time?
Obsession, accident and a great deal of love, to say nothing of the interventions of an elderly antique dealer, a youthful solicitor and one very grumpy ginger cat, conspire to answer Cassie’s question. Can she possibly hope for her heart’s desire?

Books Five of the Time Into Time series