The letter merely lacks a seal.
This letter is a quest item which is obtained at the end of Chapter III. It, along with the Professor's Report, are necessary to complete a quest.
| The Professor's letter
Azar, you fool! You failed to foresee that the boy Alvin, upon whom we placed so much hope, is capable of opening unstable portals! Shortly after we captured him, the little shit simply disappeared. He was so scared his legs could hardly bear him, and yet he gave us the slip. I spent a fortune finding the teleportation trail, so I know where he is, but I lack people and can't possibly send my imbeciles after him. I have decided to send a man we need to test. True, I doubt his loyalty, but either way we will recover the boy. Send your people to the village of Murky Waters immediately. If my messenger fails to return with Alvin by the time they get there, they should kill him and bring the child to you, to the laboratory. Hurry, time is of the essence.