Carol Starkey is struggling to pick up the pieces of her former life as L.A, & finest bomb squad technician.

Three years have passed since the explosion that shattered her life and now, fuelled by alcohol and prescription drugs, she's doing time as a detective with LAPD's Criminal Conspiracy Section.

Then a seemingly innocuous bomb call turns into a charred murder scene. Carol is put on the case - and quickly discovers an intent behind a series of explosions that is far more disturbing than it first appears. Each attack is designed specifically to kill bomb technicians, and now Carol faces the most intense and personal fight of her life; a fight that reaches back three years into her past...