You let her in. Was that your first mistake?

Stranded in Paris during an air traffic crisis, Laura offers to share her hotel room with a young woman who seems lost and alone. It's a split-second act of kindness--one any good mother would make. But as the girl slips away at dawn, Laura feels a whisper of unease.

Weeks later, as her precious family is targeted one by one, Laura's ordinary life completely unravels and she can't shake the feeling that everything leads back to that night.

Suddenly she's in a police cell, the main suspect in a serious crime. But what has she done to deserve this? Laura must battle to unlock the secret behind this darkest of nightmares, while trying to save her family.

If she fails, will it all be her fault?