The Curtain Rises (the Warrender Saga, volume #4)
Nicola had everything in life to look forward to, when the brilliant young musician Brian Coverdale implied that he would be asking her to marry him as soon as he returned from his tour to Canada. But Brian never came back; and Nicola's life was shattered when she learned that he had died suddenly. She was fortunate to be offered a post just then as secretary to a world-famous opera singer, for such a fascinating job would certainly help her to take her mind off her troubles, and introduce her to a new world of music and interesting people. But almost the first thing it did was bring Nicola into contact with the one man in the world she least wanted to meet - the man who had been responsible for Brian's death.