Molly lives a quiet, contained life in London. Naturally risk averse, she gains comfort from security and structure. Every day the same.

Her identical twin Katie is her exact opposite: gregarious and spontaneous. They used to be inseparable, until Katie moved to New York a year ago. Molly still speaks to her daily without fail.

But when Molly learns that Katie has died suddenly in New York, she is thrown into unfamiliar territory. Katie is part of her DNA. As terrifying as it is, she must go there and find out what happened.

As she tracks her twin's last movements, cracks begin to emerge. Nothing is what it seems. And a web of deceit is closing around her.