A family murdered; an undercover police officer assassinated. Detective Nate Grimes is tasked with solving these seemingly unrelated murders.
There's a young witness to the murder of the family. However, the witness has amnesia. As Grimes works to protect the witness, he discovers there's a malevolent presence lurking in the shadows. A presence that will do whatever is necessary to keep its existence secret including murder.
Now both his and the witness's lives are in danger, unaware that their greatest threat is within the police force itself.