The Doctor looked down at the necklace. He didn't recognize it, but he didn't recognize the handkerchief or the note at first, either. Or even the cufflinks, which he kept for the last two hundred years to remind him of Jack. This necklace meant something. And this Bea meant something, too. Well, obviously, considering she was trying to find him.

"Stay," he said, tucking it back into his pocket. "Can't miss out on an old friend, can I?"

He took a few steps forward and waved at the boat, which was slowing down as it came towards them. Seven armed men on the back in bulbous black helmets turned their weapons to them.

"At least, I hope it's a friend."