Look In The Mirror by Catherine Steadman

When Nina’s father dies, she is left something in his will: a gleaming dream vacation home in a balmy tropical paradise.

Still grieving her father's death, Nina learns she has inherited property in the British Virgin Islands—a vacation home she had no idea existed, until now. The house is extraordinary: state-of-the-art, all glass and marble. How did her sensible father come into enough money for this? Why did he keep it from her? And what else was he hiding?

Once an ambitious medical student, Maria is a nanny for the super-rich. The money’s better and so are the destinations where her work takes her. Just one more gig, and she’ll be set. Finally she’ll be secure. But when her wards never show, Maria begins to make herself at home, spending her days luxuriating by the pool and in the sauna. There’s just one rule: Don’t go in the basement. But her curiosity just might get the better of her—and soon she’ll wish her only worry was not getting paid.