Here's a bit from a walkthrough after Agatha dies:
Agatha takes care of Carven, but will die. Take her bracelet.
Go to the first garden and enter the palace the same way as you did before (with the ladder). Go through the secret passage to the room with the stone lion. Go halfway down the stairs and listen again to the footsteps of the guard. Move quickly to the front door. Outside, move forward, turn right, forward and turn right. Enter the second door of the right wing, which leads to the left tower (and to the second cd).
I can't tell from reading the walkthrough whether or not you actually need to enter the room with the stone lion. Let's wait and see if someone who has played this game can offer more help, if needed.
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