Nicole Kidman wakes each morning with no memory of the last 14 years, leaving doting husband Colin Firth to patiently explain who he is every day.

Mark Strong is a neurosurgeon whose surreptitious gift of a video camera helps her to slowly piece her past together.

However, the more she discovers, the more she realises that she may be in danger and the more scared she becomes – and who can she really trust?

Kidman’s disorienting plight is both affecting and chilling, but the plot’s cunning twists are a little too predictable for the film to grip as tightly as it should.