It's every parent's worst nightmare.

Best friends Ingrid and Ciara hate their lives.

They're being bullied at school and resent their parents for bringing them into this world.

So, they've made a pact: tonight - at midnight - they're going to end it all. And nobody will be able to stop them.

Except, perhaps, for former detective Helen Brennan, who overhears a phone call that ignites memories of her darkest days.

She's determined to find these two girls, so she can stop them doing what her son Scott did twenty-two years ago.

The problem is, she doesn't know who the girls are. Or where they are.

She only knows she has until midnight to save them.

...And the clock is ticking.