To look under the bed, you have to "know" that Mordred keeps papers under there. The clue is in a note from the Princess's bedroom in the unreachable tower. To reach it:
- Get the rope from the water wheel of the mill.
- Bring it back to the castle and climb up to the crossbow archers.
- Tie the rope to one of the big arrows
- Aim it up and to the left, and you will hit the Princess tower door.
- Walk the tightrope across to it.
- Go to the far left and you will get the note that suggests where the missing page to the journal is hidden.
- Now you need to go back to the museum and on the upper level go to his bed.
- You have to click on the papers to get it.
The missing journal page has the coordinates to the nearby moon, which you can reach with the saucer Excalibur. (They are X-56 Y-52 and can be entered in the ship's launch computer when it is refueled.)
