Marnie has a life-threatening condition. The doctors believe it is in her best interests to be allowed to die, but her loving family disagree. And so begins a fight that will take them through every stage of a legal process, as they struggle to contemplate this huge decision. Who decides? And in whose best interests will it be?

• Sharon Horgan
• Michael Sheen
• Alison Oliver
• Niamh Moriarty
• Noma Dumezweni
• Chizzy Akudolu
• Des McAleer
• Gary Beadle