Kate used to be good at recognising people. So good, she worked for the police, identifying criminals in crowds of thousands. But six months ago, a devastating car accident led to a brain injury. Now the woman who never forgot a face can barely recognise herself in the mirror.

At least she has Rob. Kate met him just after her accident, and he nursed her back to health, in his high-tech, modernist house on the Cornish coast. When she's with him, the nightmares of the accident fade, and she feels safe and loved.

Until, one day, Kate looks at Rob anew. And knows, with absolute certainty, that the man before her has been replaced by an impostor. Is she right? Have her old recognition skills returned? Or is it all in her damaged mind?

Gripping, emotive, original and complex, The Other You is a psychological thriller that explores memory and identity, paranoia and pretence – and asks whether we ever truly know the people we love.