Aunt Dimity, book 03: Aunt Dimity's Good Deed
Nancy Atherton1996

Lori Shepherd's marriage is on the rocks. Husband Bill's an incurable workaholic who seems more interested in managing his family's law firm than in starting a family of his own. Lori tries to rekindle their romance on a second honeymoon at Aunt Dimity's English cottage, but once again, Bill begs off.

Discouraged, Lori takes off for England, accompanied by William Willis, Sr., her staid and reliable father-in-law, who promptly disappears with Lori's pink flannel bunny, Reginald, in tow.

Lori's search for Willis, Sr., leads her into the arms of a devastatingly handsome English cousin and back in time to a centuries-old Willis family secret. By the time she and Aunt Dimity have solved the mystery, a new little Willis is scheduled to toddle onstage.