Daphne Du Maurier has always been on the periphery of my consciousness, as the author of Rebecca and My Cousin Rachel, both of which I've not read but have seen the film adaptations. So the revelation that she was bisexual comes as a mildly interesting fact. She is having a hard time defining herself sexually. Gertrude Lawrence says Daphne is really a boy--her play about a young man in love with an older woman is really about her as a man-- and Daphne spends most of the film trying to establish whether or not this is true.
I said Somerville is terrific, and she proves how inward she is with the character. The trip to Florence with Ellen Doubleday that is so fraught with tension between the two women produces some funny lines: "I'm like the river Arno with its falls all pent up, that can't get out to sea... I want to flee to a monastery or a madhouse".