Bela, an 8-year-old girl living in a home with marital problems, confronts a sinister entity that comes out of her closet. The presence, whom she calls "Other Mommy," becomes increasingly threatening to her and her family.

Following the death of his father (Josh Brolin), Jay Gardiner (Austin Abrams) goes diving off the central Coast of California in search of his remains, but is swallowed by a massive sperm whale. While trapped inside its belly with only one hour of oxygen left, Jay comes to realize that the hard-earned lessons his father imparted may be the key to his escape.