Nicolas Claux two page handwritten letter written on both sides of one sheet of paper. Claux discusses some of the killers he's been in touch with along with someone who he plans to stalk when he is released from prison. 
At the end of the letter he has drawn a knife and fork and written, Bon Appetit!

The letter is hand signed at the close, Nico. 

Nicolas Claux Signed Letter Bon Appetit