Just Like the Other Girls by Claire Douglas

Una Richardson’s heart is broken after the death of her mother. Seeking a place to heal, she responds to an advertisement and steps into the rich, comforting world of Elspeth McKenzie.
But Elspeth’s home is not as safe as it seems.
Kathryn, her cold and bitter daughter, resents Una’s presence. But more disturbing is the realization that two girls had lived here before. Two girls who ended up dead.

Why won’t the McKenzies talk about them? What other secrets are locked inside this house? As the walls close in around her, Una starts to fear that she will end up just like the other girls . . .