The Princess's Maid's room has the secret message and the mouse. It is on the first floor of the castle, to the left. The Princess has a room in the tower that is now unreachable. Get the rope from the windmill's water wheel and tie it to one of the big arrows on the giant crossbow. Shoot it up and left and you can hit the tower door.
To catch the mechanical mouse, in the Princess's Maid's room (castle first floor left).
Nobody know's excatly what it is except for the creators that's why its called "Secret"
In the princesses bed room
You show her a secret message from the Princess. You find it in the Maid's room (castle first floor left).
in the throne room.
You need the Princess's secret message from the maid's room (castle first floor left).
well if you go into the princess room you will see a draw open it and get out the note.
get the page from the princess's room,under her bed and it will say
If you have the Secret Message from the Princess (from the maid's room in the castle), the mill girl will give you the password to the secret room below the fountain. (see related question)
There are two messages: the Princess note in the Maid's room (castle first floor left) and the note in the Princess's room in the separate tower. Both should go into your item bag.
The secret message from the Princess is in her Maid's room (castle, first floor left). There is another note by the Princess in the left tower which is now disconnected from the castle. (see related question)
The Maid to the Princess has a room in the castle (first floor, to the left), and there is a secret message and a mechanical mouse there. However, the Princess has a room in the left side tower, which is cut off from the rest. You can get the note that is there : tie a rope to one of the big arrows and shoot it that way.