The daughter of which world famous writer was named Rosalind Hicks?

Player #10178853, I own them all and have read all of them more than once. I also spent some time looking for "Black Coffee", a play which was rewritten into a novel but finished by some of other writer, whose name escapes me. The blurbs on the cover praised the finished work, saying Miss Christie would have been proud. I think it was a travesty and Miss Christie would be ashamed and appalled. All by way of saying, don't bother with "Black Coffee".

I love her novels and have read most of them