Hello! Trying something new today, so please be patient with me! I've tried to keep the chapters short and sweet. Reviews are very greatly appreciated!

DOCTOR WHO AND HETALIA BELONG TO THEIR RESPECTIVE OWNERS, NOT ME

4th Doctor

The Doctor had thought nothing of the fist hint.

He had been wearing his fourth face. He whistled a tune as he strolled into the U.N.I.T. base. He'd received a message that the Brigadier wanted to speak with him, and he could never turn down a chat with the Brigadier. Well, as long as that chat didn't involve him doing any serious work. Knowing he was early for once, The Doctor sat himself down on a chair, and popped a jelly-baby into his mouth.

He didn't have to wait long until Brigadier Lethbridge-Stewart briskly walked into the waiting room. "Ah, Brigadier!" He said with a smile on his face.

"Doctor." The Brigadier promptly replied outstretching his hand which The Doctor shook gladly. "I see you received my message."

"Yes, now what is this all about?" Asked The Doctor. "Nothing too serious, I hope."

"Oh no, no. In fact I simply wanted to pass on a message myself." Said Brigadier.

"A message? What kind of message? From Earth? Did they leave a name?" Asked The Doctor, intrigued. He usually didn't stay in one place long enough for anyone to leave a message for him. Except his companions. His mind flickered to dear Sarah; he was yet to tell her that he had returned. He probably never will at this point. He frowned, lost in his thoughts.

"Human, I assure you." Answered the Brigadier, completely oblivious to The Doctor's nostalgic expression. "A young man came in here a few weeks ago, asking to leave a message for The Doctor. He didn't seem interested in speaking to you in person. We asked him for his name but he said that you'd already know."

"Interesting… what was his message?"

"Now that is the strangest part of all. He told me to thank you and for you to "continue keeping your adventures a secret", whatever that means."

"A few weeks ago?" The Doctor said, thinking back to what he had done a few weeks ago. Ah, yes! He had prevented an alien disease from spreading throughout the country. He had almost revealed his identity in doing so, but had managed to think of an alternate way of explaining to the people that he knew what to do.

"Yes..." Said Brigadier, obviously awaiting an explanation from The Doctor about what the message meant.

"Well in that case, if that's all you had to say, good day to you, Brigadier" And with that The Doctor left a confused Brigadier with his thoughts and began walking back to the TARDIS, wondering who on earth could have left him that message.

The second hint left The Doctor slightly suspicious.

It was 1876 and he was leaving Buckingham Palace after discussing Queen Victoria's new title as Empress of India when he saw the letter pinned to the front of the TARDIS. It was in a plain envelope addressed to "The Doctor", so naturally The Doctor picked it up. He decided on reading it once he was back inside the TARDIS as letters addressed to him usually weren't very friendly.

Once he was safely inside, he cautiously removed the letter from the envelope (half expecting something to jump out) and unfolded it. It was written in English in small, neat handwriting.

It read:

Dear Doctor

I would like to formally thank you for the countless times you've saved my life. I cannot think of enough words to express my gratitude. What you do for the people and I is unparalleled and I can only hope you will continue to do so. Forgive me for criticizing you, but could you please take slightly more care in your work. There's been many occurrences where I have had to personally deal with the aftermath of your mishaps. I can only hope your next face will have more sense than this one. Stay safe, Doctor.

I am forever in your debt.

(There was a squiggle of a signature which The Doctor couldn't decipher)

(P.S. You already know my name, therefore I won't go to the trouble of repeating it.)

The Doctor took off his hat and scratched his head. Who could have sent this letter? He had only been talking with the Queen for a few minutes, and the T.A.R.D.I.S. was in palace grounds so it had to be someone with enough authority to walk around unnoticed. But who?

After re-reading the letter and gaining no answers, he carefully slid the it back inside the envelope.

The Doctor had felt a sense of déjà vu when reading the letter. He thought back to the mysterious message the Brigadier had given him a few months ago, which had also been about thanking him, and was also from someone who claimed that The Doctor already knew their name. Of course, the man must be quite young to have lived over 100 years, but it was not unheard of. But wait, didn't the Brigadier say that the message had been left by a young man? Then perhaps it was a relative, or these were different people who shared a title?

In any case, this was a mystery that kept on nagging The Doctor, who refused to let it go. He was going to find this man. At some point. Probably later. The Doctor had bigger things on his mind, so he let these connected messages settle themselves a place on his mental to-do list.

The third time was enough for The Doctor to realise that whoever he was dealing with was certainly not normal.

It was 1939, and many people were preparing to go to war. This message was simple, a piece of paper pinned to the T.A.R.D.I.S. saying:

"Take care of any unwanted visitors whilst I'm at war. I'm leaving the country and people in your hands."

Upon reading the note and seeing the signature The Doctor had immediately made the connection between the messages. It was clear that he was a big part of this mysterious man's life. The Doctor could now whittle down possible suspects. It would have to be someone with a large amount of authority, if they helped rule the country. But wouldn't they have to be at least 63 by now? That was no age to go to war in, especially if you have a high status. He decided to check the soldier files, to see if anyone was around that age.

The Doctor sighed. He had found nothing in his search. Whilst there were a few older men fighting in the war none had a high status, which ruled them out. So unless this man was alien or simply immortal and very patriotic then there's no way that-

"Hold on a second…"