When you're trained to protect the lives of others, how far will you go to protect your own?

Laura is a perfectionist and extremely capable air ambulance doctor. As part of the ethics committee at the hospital, she is also the person who chooses whether critical care patients live or die. She's worked hard to get here: gruelling years at medical school, made bearable by her two best friends, level-headed Olivia and livewire Anjali. As wild all-nighters and exam pressure gave way to the struggles and joys of new motherhood and new jobs, their unbreakable bond has supported each other through it all.

And then, one night, life overturns in an moment and the past threatens to shatter everything they hold dear in the present. Can even those we trust with our lives be dangerous in the right circumstances? And is there a limit to what we would do for those we love?