well and after long anticipation after see a few clip on bravo the 100 scary movie moment i have long await to see this film . the plot be simple and beautiful model alison parker ( cristina raines ) move into an apartment building that a gateway to hell . the sentinel be a down right creepy film and even if it a bit slow . it a mix of the omen and rosemary baby . the acting be fine and and there be some truly disturb bit such a the awkward orgy scene with the dead father and the chubby woman in the middle of the orgy eat cake and laugh the end be a weird mix of deformed people and cannibal . it a very odd and campy but in the end and i truly believe a great film . one of my favorite from the 70 and even if it nothing greatly original . it wacky and extremely creepy . probably one of my all time favorite . positive .