Elise and Esther-III

Esther was spending her night in silence when she heard a knock on her windows. As she knew her life was prone in danger every second she spent in the castle where there were three Demons, she cannot sleep without holding to her to her guard or lowering them. Though she heard the sound of the knock, it was not until morning that she dared to open the window to see what may have hit the glass to see the folded paper next to her window frame.

"This handwriting is similar to Thomas's..." whispered Esther to herself. But was it really Thomas's? She recalled during her feet entering the White Mansion of how thick the barrier was to prevent unwanted things to enter. She first noticed it when she passed by one of the corridor where she noticed a magic circle was carved on the ceiling. The Demon was crazy enough to put such a strong barrier that if a normal Demon was to enter they would be rip to pieces, then how was Thomas able to sent the letter?