Clock Letter

It's an old letter on fancy paper.

A letter found in a german clock which is tucked away in Rebecca Knight's attic.

Contents
"The letter is written in German, but Gabriel determines what he can about it...

It was sent from a place called "Schloss Ritter" in Rittersberg, West Germany. The letter is adressed to "Mein Sohn Heinz" and signed "Wilhelm Ritter". One of the reoccurring words strewn throughout the letter is the word "Schattenjäger."

The only other thing that Gabriel can decipher about the letter is a sense of urgency in the handwriting and in the heavy use of a quill tip, bold strokes, and underlining."

Trivia

 * With the letter, Gabriel finds a picture of his grandfather, Heinz Ritter, his granduncle, Wolfgang Ritter, and his great-grandfather, Wilhelm Ritter. It's dated Schloss Ritter, 1925
 * Gabriel can show the letter to Gerde. She doesn't translate it, though. She only states it written by Wilhelm to Wolfgang's brother Heinz and that it was written some time ago.
 * Gabriel can show the letter to Wolfgang. He also doesn't translate it, but he says: "It looks like a letter written many years ago to Heinz from our father. Poor Papa tried to get Heinz to come home, but Heinz refused."
 * The specification "West Germany" in the address is strange, as Germany was not separated when the letter was written. Germany was split into East- and West Germany on 23 May 1949; more than 20 years later. Also, it was reunited on 3 October 1990; three years before the events of the game.