When in st Sulpice i think you are automatically in a cutscene & a bad guy is there attacking sister margarita.you have to kill the guy so put on PHILLIPS EXETER in the codes option. Kill the guy & she will say something. Then when you can move around go in stealth to the balcony & kill the guy.Go to the ground floor be in stealth & kill the 2 guys & go to the place where a book is read it and do the puzzle on the floor .Then get the statue from the stand.Go back to the place where you came from.Go to the opposite side then go inside the glowing lined door & examine the shelf & take the cutter.Then go to the door with the lock and break it.Go up and do the puzzle .the solution is 38:11.then go down again and in the fountain there is a key take it &go 2 sister sandrine's room & examine her desk & closet.in the closet take the other statue and examine her right hand then go to the bed and do the puzzle the answer is sion.then go down and place the statue at the 7 place &the2nd one in the 14 plce.the crypt will open.