Italianhitman

Hey, I'm stuck in the Tomb of (the dead guy) Sac-something. Anyhow, I can't find the ritual, I read a walkthrough, that said I must go to Latrop, but that could be a problem b/c I can't find Latrop. Any help would be nice. Then, I decided to go to the slith castle, I can't open those doors, the portcullis things. HINTS please, if at all possible for the slith castle.