It starts of like a great movie, the actors are fine, the camera and scenes look like that of a high quality movie, the soundtrack is good - all the ingredients are there. However, it starts getting strange already, when the couple Ken and Rachel finally meet up with Marco. Premises set: Marco is an old friend of Rachels and in love with her while she is having a serious relationship with Ken, who is ambitious and successfull while Marco had to travel the world to "find himself" (only to realize that he actually loves Rachel).

Of course these three are on a boat trip, and this is already the first thing that seems strange. However, before they start, there is talk about greek mythology and sirens (oh what a clumsy hint, already?), and of course - Marco changes course to an island because he saw a guy in need of help, they strand (and have to fix the motor from the inside to get off again?), the guy dies so they decide to swim over to the island to bury him only to find a beautiful, misterious blond, and from there on, they move forth and back from ship to island, to actually do nothing but wander around and having dreams and fantasies; and up to the ending of the movie that's it.

The biggest problem of this movie is, that it is utterly boring. Nice locations, great setting, and stunning pictures as well as decent acting apart, actually nothing interesting happens - even all the dramatic scenes are so badly done that it just bores you. **Action**? Not a bit, **Thriller**? Do you actually know the meaning of this genre? **Horror**? Ahahahahaha.

Then there are a lot of actions that seem totally random, or do not have any meaning at all (e.g. they stumbling across the boat and the bodies, where Rachel freaks out even though she didn't actually see the bodies, and even though she was totally calm, when the guy they rescued, died). And last but not least, this movie is far from being settle. Calling it "Siren" already tells you what to expect - talking about Greek mythology does not help being suprised about what they'll encounter on the island, and making it so absolutely obvious that Marco is still in love with Rachel only makes you wonder when this will actually become a problem - and it will suprise you that they even did not manage to action-whise cash in when that situation finally arises in the movie.

Seriously, one of the most broing movies I've seen. Even movies that I've rated lower did actually deliver more thrill than this one. Great potential for a good movie destroyed by a horrible script/director.