When Lauren takes a photo of a stranger on a beach and shares it online, she has no idea what will come of that single click. Her daughters are surprised that she posted a photo without consent, but it's only when she starts to get anonymous messages about the woman on the beach that she deletes the photo. It's too little too late, and the messages escalate, prompting Lauren to confess to the woman. The woman has her own dark story, one that might explain the messages, but Lauren isn't convinced. Meanwhile, the messages from the internet troll become more personal and more vindictive. And then she makes one small mistake that brings everything tumbling down.