When a top secret programme of implanting harrowing memories into innocent people comes to light, neurosurgeon Tom McCarthy is literally caught in the crossfire. Whilst McCarthy looks forward to a three day weekend, his office is suddenly raided by two Department of Defense investigators bent on arresting him for a crime he didn't commit. All hell breaks loose when an inadvertent scuffle escalates, leaving one agent dead at the hands of the other, and McCarthy fleeing, but hopelessly trapped inside the labyrinthine corridors, heating ducts, and stairways of a gigantic Seattle Medical Centre. With the CIA and Seattle PD closing in, McCarthy unwittingly pulls Dr. Sarah Hamilton into the fray. And like rats in a maze, they struggle to stay one step ahead of their deadly hunters, whilst simultaneously uncovering a trail of corruption that reaches shocking dimensions.