Blake Lively stars in this thriller directed by Jaume Collet-Serra. When experienced surfer Nancy Adams (Lively) goes against all surfing protocol and takes to the waves alone, the peaceful serenity of the water around her quickly changes as she gets attacked by a hungry great white shark. As she frantically tries to swim away, she manages to climb onto a large rock just 200 yards from shore, but she soon comes to realise that she is in the middle of the shark's feeding ground and is unable to move from the rock. Will she able to distract the shark and swim back to shore?