Hermit
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We read the Prologue. When Laura's parents were already in the hospital after Laura's death, the position of chief physician was vacant. Reila wasn't even here at that time; he couldn't have been involved in the death; it all makes sense. So, along with the title of the night, I'm almost certain about the deaths of Cherletti and Reila.
Added 1 minute ago
And why Arandor Cherletti?
Всё не так плохо как Вы думаете. Всё намного хуже!