Luna and her sister are devastated after their mother’s sudden death.

But when a lifelong secret is revealed, they must return to her birthplace in New York to settle affairs.

In Brooklyn, they soon find more questions than answers, until something impossible – magical – happens to Luna, and she meets her mother as a young woman back in the summer of 1977.

When Luna realises she’s not imagining things, and can truly travel back in time, she is determined to change things.

But in doing anything – everything – to save her mother’s life, will she have to sacrifice her own?