How could something as innocent as a smile lead to murder?

When Miranda Cotton gets home from work to find her new boyfriend, Brendan, reading her diary, she breaks off the relationship and throws him out of her flat. Getting Brendan out of her life, however, is not so easy.

Two weeks later her sister, Kerry, phones her in ecstasy. She’s in love. She has a new boyfriend. He’s called Brendan . . .

So Brendan is back in Miranda’s life – with a vengeance. But why has he done this? And what does he want from her?

Soon what began as an embarrassment, becomes like an infestation - and then more terrifying than her worst nightmares . . .

Secret Smile, a story of love, obsession and revenge, is surely Nicci French’s most chilling novel yet.