"Rebecca's Tale"(Sally Beauman)

 "On the twentieth anniversary of the death of Rebecca, the hauntingly beautiful first wife of Maxim de Winter, family friend Colonel Julyan receives an anonymous parcel. It contains a black notebook with two handwritten words on the title page -- Rebecca's Tale -- and two pictures: a photograph of Rebecca as a young child and a postcard of Manderley. Rebecca once asked Julyan to ensure she was buried in the churchyard facing the sea: if she ended up in the de Winter crypt, she warned, she'd come back to haunt him. Now, it seems, she has finally kept her promise..."

There have been a number of sequels to Daphne Du Mauriers' "Rebecca."This is the one most often recommended to me.