She felt herself spin around, trying to figure out what was what. Everything was completely confused, as if she’d fallen into a maze and she couldn’t figure out what to do next. They were identical. It was like looking in a mirror, but where she just felt so happy to be here with Rachel, she could see the panic rising in her sister’s eyes. Go back, go back; it’s time for you to go back to your life, Rachel was saying, but Liv couldn’t leave her, not yet. She swam towards her now, the gut-wrenching exhaustion, a mixture of freezing cold and an emotional shock beyond any she’d ever imagined, began to tug against her chest. She was swimming hard and still getting nowhere. There was no way forward and she watched as her sister’s eyes filled with the sort of fear that Liv had only ever felt when she’d watched Rachel pass slowly away from her. She had to get to her. She pushed harder, harder and harder until it felt as if her whole body might explode with the effort and then she knew, she was moving forward. She was making her way slowly towards Rachel and Pete.

But they were screaming at her now. You have to go back. You can’t follow us. It’s not your time yet.

Liv wouldn’t go back; she just wouldn’t leave them here. She had to concentrate. She couldn’t for one moment take her eyes off Rachel. It seemed as if she’d been swimming forever, but somehow, here she knew that time had frozen over as surely as the ice had begun to patch itself along the water’s edge.

When she stood opposite them, it took a moment to gather her wits. She had to save them both. And then she realised she couldn’t save Rachel. She couldn’t help it, she threw her arms around her sister, grasped her to her as if she’d never let her go. I love you, she mouthed to Rachel, Don’t forget me.