I am looking for a book about three cousins – two girls, one boy – growing up together in a rural setting. I think they are all orphans. 
One girl is a talented singer and both of the other cousins are in love with her. When they are young adults the two young women go to Paris (?) so that the talented singer can work on the stage while the other woman is her companion. The young man goes to visit them. The singer is working in a music hall and is upset that the producer (?) is leering at her or setting her up to be leered at by the audience. 
The second young woman becomes uncontrollably jealous and I think there is a gothic sort of death of one or both women, possibly involving a fire. 
The book was made into a period drama tv movie or series in the late 80s or early 90s. I would say a BBC bonnet drama, but I’m not sure if it was the BBC or not. In the music hall scene, the singer is sitting on a swing on stage.
For years I thought it was My Cousin Rachel but it isn’t! It did have a bit of a Daphne du Maurier flavour with a psychological drama aspect.