An ex-homicide detective with memory loss is forced to solve a brutal murder, only to uncover chilling secrets from his forgotten past.

When a massive sinkhole mysteriously opens in Los Angeles, it tears a family in half, separating mother and son from father and daughter. When part of the family finds themselves in an unexplainable primeval world, alongside a disparate group of strangers, they must work to survive and uncover the mystery of where they are and if there is a way back home.

Set in the near-future, technology controls nearly all aspects of life. But when the world of Grey, a self-labeled technophobe, is turned upside down, his only hope for revenge is an experimental computer chip implant.