The movie starts with three people who have fallen off a boat. Its night, and they are in the water, sharks cirkling around them. Then, some screams. It lasts under five minutes, and you see no shark attacking.
Three months later, we are home (a large mansion in England) with Lexy, who lost her father and sister at the sea. We never find out if their bodies were recovered.
Lexy suffers from survivours guilt, and have little recollection of the event. She knows they partied on the boat, drank alcohol and were dancing.
Her boyfriend, Isaac, and her stepmother, Vicky also live in the house, and they were also on the boat that night.
She has a good friend, Amy, who are supportive, and also wants Lexy to get some help. Which is needed, because Lexy is whining a bit too much.
There are no more sharks to be seen, and just a few scenes from the boat. This is a drama/mystery movie, where we want to find out what happened that night.
There are some gaping plotholes, as to why the solution wasn't discovered at once, or why Lexy takes so long time to realise what's happening, but there you are.
The solution is exactly what you think, including the people involved and the motive.
The killer's plot on how to do away with Lexy in the end, is laughable, and utterly impossible to work, without no one finding out.
Acting is ok. Lexy is the worst, but that is because it takes some real acting skills to carry a movie. And she does not have what it takes.
