Whitney Cameronn (Cotten), a man with a strong affection for his sister-in-law (Peters). When one of her stepchildren dies, it's revealed that the child was poisoned to death. Whitney suspects his sister-in-law committed the murder and is afraid that her other son may be in danger. The film climaxes during an ocean voyage aboard a cruise ship.
Kryptic is a psycho-thriller about a woman’s search for a missing monster hunter and her growing realisation that she is inescapably linked to the creature being pursued.