Good evening ladies and boys

i′m on the way to give back this key which where stolen by mercer and now i stuck on a problem... in front of me is a huge statue of a women i think it is nocturnal an the diary says i must give her something but it cant be weard, seen, or felt. so....what interaction should i do? i dont know and i have no idea while im looking in my inventory and spellbook.

please....give the great nightingale a little light in his head so that he will find the answer while hiding in the shadows ^^

Its not the statue. It involves turnjng the lights off.... Look around for chains to pull...