"You are not sure you want to know why this was under the bed."
The Rope is an item found in Prisoners of the Elder One. It is located in the bedroom under the bed, and is used to climb out the window into the garden. It can also be used to rescue Aya, though the grappling hook also works. Once placed, the rope can be taken back, as the Garden can be entered through other means once the garden key is acquired.