Triangle (2009 British film)

Triangle is a 2009 British psychological horror thriller film written and directed by Christopher Smith, and starring Melissa George and Michael Dorman. The film was released in the United Kingdom on 16October 2009. George plays a single mother who goes on a boating trip with several friends. When they are forced to abandon their ship, they board a derelict ocean liner, where they become convinced that someone is stalking them.

Jess later arrives at the harbor alone and boards Gregs boat. Joining them for the trip are Victor, a runaway teen who lives with Greg Sally and Downey, married friends of Greg and Heather, a friend of Sallys. While on the boat out at sea, they are overwhelmed by a storm and Heather is swept out into the water when the boat capsizes. When the storm clears, the others climb onto the upturned boat.When an ocean liner arrives, the group board it, only to find it apparently deserted, though Jess experiences a sense of dj vu as they explore. Various strange occurrences take place on the ship, hinting that there is someone else on board, though the person remains unseen. Jess eventually witnesses the others die one by one Victor from a wound in his head, while Greg, Sally and Downey are shot by a burlapmasked shooter. The shooter chases Jess to the ships front deck, but she fights back she disarms and sends her assailant overboard. ........

Source: Wikipedia