Like every other version of this story since the beginning of time, 13 starts on a stormy evening. Sarah is sitting home alone when a man comes to the door, he has some papers for owner of the house to sign. The guy is kinda fat and creepy and Sarah knows she shouldn't do it, but she lets the fat guy in. While they wait out the storm, reports of a series of killings begin to play in the distance. Sarah and fat boy sit and speculate on who the killer may be and why he's carving the number 13 into his victims. Of course this conversation gets fat boy going on a creepy rant. Just when Sarah is getting ready to throw out the creepy fat guy, another stranger arrives at the door. This time it's a security guy with a God fetish. Sticking to the formula as these things always do, Sarah lets him in even though she already has one potential nut job in the house right now. Right on cue, conflict between the two men begins to erupt. The more time the three of them spend together the more they begin to suspect someone in the house may be a killer.

Despite being a  formulaic, 13 does manage to throw a few twists and turn into the film. Even though you know the killer is someone that Sarah has let into the house it doesn't turn out to be the person that you may be expecting. So while they get an "A" for effort with the plot twits, there comes a point in the movie where you know exactly who the killer is and how things are going to play. But I don't completely fault the writers and directors for the films predictability; there is only so much that can be done with the old "stranger in the house" routine and still make sure it's relatively interesting. 13 makes for a good popcorn movie on a rainy night, but it isn't much to get terribly excited over.