i have read a lot of review slat this movie but i find this to be tense engross thriller . medical student marty ( justine bateman ) need a roommate after her flat get break into so she take in alec ( adam baldwin ) . at first he seem like a nice young man and he like opera and cook and seem like the perfect roommate till he decide he want marty for himself . he begin change the lock and transform the flat and finally lock marty in a padded room . anyone who get in his way get dispatch by various mean which include kill someone with a tyre iron . justine bateman and an actress we just haven not see enough of and be great a marty who think she can look after herself till she realise thing be out of her control . sure we have see this all before in various movie but this film be lift by adam baldwin who be more creepy and evil than one can possibly imagine and he certainly scar the hell outa me . i like the way this film use violence and psychology to put it point across and it certainly put me off ever take in a lodger . deadbolt i give positive .