I found the plot summary for the movie on IMDb:
On her first trip to Paris, a young woman hits a party in the Catacombs, the 200-mile labyrinth of limestone tunnels under the city that's lined with the remains of 7 million people. Separated from her friends, she becomes convinced that someone or something is chasing her.
Though the ending was a surprise, this was also another waste of time movie.
Sister writes to girl about coming to paris.
Girl said "My sister sent me a postcard. All it said was, "Come to Paris. It will be good for you." Forty-eight hours after I arrived, she and everyone I'd met were dead. "
Girl goes to paris, goes through customs and then meet up with sister.
Sister takes girl to her place then tells girl one fucked up story.
Girl goes to a rave with sister in the catacombs (which is so cool).
Hangs out with a bunch of random people.
Wonder off in the dark catacombs like a fucking moron.
"Killer" kills sister.
"Killer" finds girl.
Girl runs away screaming "leave me alone!"; like the "killer" is actually going to listen.
Girl continues to run away, but make loud noises so the killer can find her.
Finds someone else in the catacombs.
Follows him until he falls into the floor and breaks his leg.
Leaves him in the floor and take the map.
Runs into the "killer" again.
Hits "killer" with train pick thingy.
Sister is alive and laughing at girl.
Sister and friends played a joke on girl.
Sister then realized that "killer" a.k.a boyfriend is dead because girl hit him with the train pick thingy.
Sister starts spazing out calling girl a dumb bitch and such.
Girl snaps (which I would to. I mean come on what did sister expect? Girl thinks she's being chased by a killer).
Girl hits sister with train pick thingy.
Then hits sisters friends with train pick thingy killing them all.
Girl find her way out of the catacombs all covered in blood.
Gets into a cab and tells the driver "airport, please."
Yeah, complete waste of time. Oh yeah did I tell you that Pink plays in this?
Here's the movie trailer:
Here's the movie link: