The Shell

A re-telling of the classic La Llorona tale, a woman and her stepson uncover a mysterious seashell that expels more than just "ocean sounds" - a lot more. Gloria Stanson suffers from severe mental instability and is willing to do whatever it takes to keep a past terrible deed a secret, including murder. Yet unbeknownst to her is a supernatural presence that has entered her life, capable of stopping her for good. - IMDb