Amantes y abuesos (Late for the Wedding) by Amanda Quick
Together again in Regency England, Tobias March and his mesmerizing partner, Lavinia Lake, accept an invitation to a country house party at Beaumont castle hoping for some much needed rest and relaxation, only to find themselves involved in a murderous and mysterious weekend. A murder is committed at the castle, and Lake and March launch their investigations. They fervently pursue their leadsand each otherthat take them from society's most elegant haunts and most discreet hideaways to London's shadiest back streets.
Amanda Quick, pseudonym for Jayne Ann Krentz, is the author of Deception, Desire, Don't Look Back, Mistress, The Paid Companion, Ravished, Seduction, and Slightly Shady. She lives in the Pacific Northwest.