A woman wakes up locked in a house, injured with no memory. She's terrified and a little relieved to find a woman bound in another room. These two strangers must work together to figure out what's really going on before the door is unlocked.
After surviving a shark attack, a young woman is plagued by nightmares of being stalked in the dark sea by a ravenous predator, and by hallucinations of visits from her sister and boyfriend, both whom were killed in the attack.