The story of the acid murderer's first victim is revealed, asanother suspect enters the frame. Gabriel receives some help inhis investigation from an unexpected source - but is thesituation more complex than it seems? As Gabriel indulges inreckless, self-destructive behaviour that could jeopardiseeverything, he is blind to the possible consequences of thelife that he is leading. The casual cruelty of Gabriel's vanityis exposed, and his relationships come under more strain.Meanwhile, the team have to face up to the fact that they havea serial killer on the loose and begin the hunt in earnest. AsGabriel sets his sights on tracking down the first suspect,Elaine makes a difficult decision to revisit her past.Finally, while tracing the journey of the first victim's finalsteps, the identity of the killer is unmasked.
