Grace Monroe goes undercover as a live-in nanny at the home of Ben Curtis whose wife Lydia has been missing for a year. Making herself indispensable in the intimacy of the family home, Grace hunts for clues as to what befell the mother of two. It’s a game of cat and mouse with Grace prepared to do whatever she must to win Ben’s trust.

A fire bomb attack on Ben’s car following his public appeal brings unwelcome media attention and Una’s insistence on making contact with the children threatens to expose Grace and undermine Ben’s trust in her. But news about a sighting throws everything into question.

Tiny clues lead Grace to the revelation of where Ben most likely hid his wife’s body. But Ben becomes suspicious as news of the search operation breaks. Can Grace hold out? And what if Lydia’s body isn’t found?