It took Donna a moment before she recognised the girl. "You!" She said, pointing angrily. "You tried to stab me!"
The other redhead recoiled in surprise, eyes going wide. "I did what?"
"What?" The Doctor asked, looking between the two women. He had recognised the voice as the one in the message, but he had never seen her before, at least not that he could recall. "When?"
"She was one of those creepy Pompeian nuns!" Donna said, stubbornly. "The ones that wanted to sacrifice me!"
"Donna, they had their faces covered with white clay and painted with..." The Doctor replied, trying to reassure his companion, the mysterious woman, however, saw fit to interrupt.
"I was?" Amy asked, laughing in amusement. "Love a Roman, me." She smiled at them. "I promise I won't actually let you die, Donna, no matter what daft cover I'm under." She nodded at The Doctor. "Besides, you know how he gets if he doesn't get a chance to save someone now and then."
"Amy, I hate to break up the reunion, but we don't have time for this." Canton said, sounding slightly irritated.
"Rule 408: Time is not the boss of you." Amy said seriously, tapping him on the nose. "But let's go ahead and release the troops."
The Doctor reacted in surprise to hearing one of his rules repeated by a stranger. He recoiled, finally understanding, in some way, what was happening. "Ye..bu..who are you?"
"Pond, Amy Pond." Amy said in her best Sean Connery impression, flipping her hair a little before turning back to the perplexed agents she and Canton had brought with them to the library. She turned serious, all the previous teasing disappearing. "All right, we know why we're here." She said simply. "We are trying to determine what The Silence is after, and why they've chased everyone away from The Library." She held up her hand. "If you see one, press the recorder in your palm and speak into it. It will relay the message directly to your headquarters, and cause it to blink. Take census with the grease pencils, tallies of five. Understand?"
There was a collective yes, and Amy turned away, allowing Canton to give them search patterns. He was better at that. She focused instead on The Doctor and Donna. "So, what brought you here? Or was The TARDIS just being herself?"
The Doctor looked at Donna and then looked back at the mysterious woman. "Uh, well, we picked up a distress call...what exactly is going on here?"
Amy nodded a little, as if it were the most normal thing in the world. "We've reports that The Silence have invaded here."
"What kind of rubbish are you talking?" Donna snapped, characteristically annoyed by the cryptic remarks she didn't understand. "Silence invaded? It's a library!"
"This is why I like her." Amy told The Doctor with a grin. She turned to look at both of them. "The Silence is a religious order, with the majority of it being populated by aliens who refer to themselves as Silents. As long as you see one, you can remember everything, the moment you look away, you forget you've ever seen one. They make people do their bidding through hypnotic suggestion." She slowed down, looking at the two other time-travelers. "We must really be out of sync if you don't know about The Silence."
"So...you've seen me before." The Doctor asked, just to confirm.
Amy nodded, but there was a brief flash of hurt in her eyes. "Ever since I was a little girl, and you crashed into my backyard."
Donna felt suddenly out of the loop. "What about me?" Donna asked. "If you know him, you must know me." She wasn't about to leave the TARDIS and go back to her normal life, defined only by how many words she could type a minute.
"Who could ever forget Donna Noble?" Amy replied, not really answering, but it would do for the moment.
"How do you plan on fighting The Silence if you can't remember you've seen them?" The Doctor asked, changing the subject.
Amy held up her palm and clicked something, causing a bright red light to flash. "Nanorecorder, you press it, speak what you see into it, and then play it back." She gestured to the team who had dispersed. "The soldiers have their own, directs them directly to UNIT, if they're compromised, the transmission ceases. Mine and Canton's came from you - they're linked mentally to us, and default to live, rerouting to the TARDIS if something happens to us." She handed a black grease pencil to both of them. "If you see one, make a tally mark on your skin, so we get some idea of how many are here."
The Doctor realised that's what must have happened. The TARDIS picked up a live signal from Amy's nanorecorder on this planet and took him there to save her - she just showed up a little early. He took the pencil, but his mind was already three steps ahead. Maybe he could stop the distress call from ever happening.