"She's in central London for the month. Working in UNIT's London base!" Sam said.

"Right and that's where?" Rory asked. He knew he knew but he couldn't remember.

"Underneath the tower of London!" Jack said.

"How are we supposed to get UNDER the tower of London?" Rory asked.

"Rory and I have been there. We can get in!" Amy said confidently. Rory looked confused.

"Why have you been there?" dean asked.

"Remember the cubes?" Amy said.

"Oh yeah!" Rory remembered it all.

"Well UNIT hired the doctor to look at them when they started to open! We were travelling with him!" Amy said.

"Ok so you take jack there and he'll help you find Martha!" Sam said. Castiel whispered to Rory.

"o-or…" he began and then he remembered that Cas didn't want the Winchesters to know he was there, "nah forget it!"

"No what is it?" jack asked.

"Don't worry it's impossible!" Rory batted the air.

"What?" Dean asked.

All eyes were on Rory now. He nodded towards Cas and mouthed "he could zap us there!" Amy sounded intrigued and Jack guessed that something was up. He didn't make a sound.

"Speak up!" dean said.

"I said that you two could distract the guards while we get Martha alone if she's busy but Youre in America and we can't expect you to come over for this!" Rory said thinking on his feet.

"That's ok it was a good idea anyway Rory!" Sam consoled.

"Hey Amy can you take us off loudspeaker now? Maybe leave the room too!" dean asked.

"Sure…" Amy did as instructed but was a little uncertain about it. Dean put the phone to his ear and walked out of Sam's earshot.

"We know Cas's there! Don't bother asking how we just do!" Dean said.

"No he's not. Why would he be?!" Amy argued.

"Amy we know he is!"

Amy was prepared to put up a fight but something in his voice made her stop.

"Fine!" she sighed.

"How- how's he doing?"

"He looks fine. Why?"

"Long story."

"I have time!"

"Have you got a few years?"

"I have a time machine!"

"Look if you find a way to bring him back here, I need you to promise you will!"

"How?"

"Just promise Amy!"

"Tell me what happened first!"

"I don't know. That's the point. One minuet he was talking and the next… and he ignore our calls and it was like he just vanished. Like he was dead. I didn't want that to be it. Then he was helping some friends of mine and he was gone when I got there. He wasn't being a great friend!"

"Oh. Sorry!"

"It's not your problem. Just promise to bring him back!"

"Yeah I promise!"

"Good! Good luck."

"To you too!"

The phone line went dead.