In mission one there is a secret room that you can find behind a statue (according to a note you find). I found where the room is by crawling through a window that leads to an underground passage, but there is only a grated window to the room that you can't access (thoere will be some people talking when you first find it, also seems that there is a rune in there as well). I can't find the way in though I've checked all the statues (actually all I see are busts, not statures), but can't find the entrance. Can anyone help me?