In one of this author's novels, the protagonist inadvertently attends a ball wearing a replica of a (*) dress belonging to the deceased title character due to the machinations of Mrs. Danvers.
One of this author's protagonists uses a drug developed by Magnus Lane to experience the 14th-century unrequited affair between Isolda Carminowe and his doppelganger Roger. In a story by this author of The House on the Strand, Mr. and Mrs. Trigg are among the victims of a series of attacks that Nat Hocken realizes occur only at high tide. In one of this author's novels, the protagonist inadvertently attends a ball wearing a replica of a (*) dress belonging to the deceased title character due to the machinations of Mrs. Danvers. The unnamed narrator is the second wife of Maxim de Winter in that novel by this author, which opens "Last night I dreamt I went to Manderley again." For 10 points, name this Cornish woman who wrote "The Birds" and Rebecca. 
One of this author's protagonists uses a drug developed by Magnus Lane to experience the 14th-century unrequited affair between Isolda Carminowe and his doppelganger Roger.
 Daphne du Maurier [or Dame Daphne du Maurier, Lady Browning] 