While Frost is investigating a series of burglaries in a black area of Denton, one of his informants, a single mother, is murdered as Mullett worries about bad press.
Reeling from the loss of his former partner, Frost resigns from the force. But, he soon returns to investigate the suspicious death of a reclusive art collector.
When an 8 year old girl disappears near the local woods, foul play is suspected as circumstances point to a seemingly harmless 20 year old with Down's Syndrome.
Working with a problematic new partner, Frost investigates a homicide and a disappearance and has to prove that he is not the man harassing women in Denton.
Frosts turns his energies to solving the murder of a doctor found with medical waste and stand by his problematic new partner despite pressure from Mullet.
Frost investigates the murder of a security guard at a quarry with an autistic teenager the only witness while DS Wallace helps Frost with an unusual series of burglaries.
Frost is frustrated in his interrogations of two men that stabbed a young woman during a robbery and a predatory professor possibly involved in an assault on a pretty co-ed.
Frost investigates a dapper con man with a taste for golf at posh clubs and other people's cars, especially after the body of a drug dealer is found in the trunk.
A crime squad detective is murdered and the evidence points to police corruption. Frost takes the lead in the investigation and clashes with the dead detective's abrasive boss.
The police have Mike Patterson under custody but he denies having anything to do with the death of the Harrises. Frost thinks the solution may lie somewhere else.
