A Little Stranger by Candia McWilliam
Daisy needs to hire a new nanny for her son; the efficient and capable Margaret Pride appears to be the perfect candidate. But as Daisy becomes increasingly removed from family life and the nanny becomes more prominent, oddities in Margaret's behaviour soon surface. Masterfully constructed and crackling with tension, A Little Stranger reveals that self-deception can be just as dangerous as the deceit of others.