Erin lives an idyllic life by the seaside with her baby boy and Australian fiancé. She's upbeat and happy - a natural mum.

At least that's what her thousands of followers on Instagram think.

In reality, Erin is struggling with anxiety and finding it difficult to connect with her screaming son. So, when an agent offers to make her the biggest Instamum out there, she can't refuse.

And when Amanda, a family friend who's visiting from Australia, says she'll move in and babysit to help make it happen, it seems like the stars have finally aligned for Erin's exciting new career.

But there's something Amanda isn't telling her.

Something that will destroy Erin's carefully curated persona online.