A manpower shortage and a rash of child kidnapped for ransom force a vacationing Frost back to work partnering with beautiful but ambitious DS Liz Maud.
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.
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.
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.