The team reinvestigates the 1950s cuddle of a young wages clerk at Battersea Power Station.
Richard Dunne was hanged for Frederick Tully's cuddle, but his granddaughter, Hannah, is waging a campaign to have Dunne posthumously pardoned.
The discovery of a suitcase containing used fivers in the attic of the Tully home sheds new light on the case, revealing a possible blackmail plot.
A trace on the used fivers reveals that they should have been destroyed in the Battersea Power Station furnaces back in the 1950s, but were actually being saved by Douglas Murray, a friend of Tully's.
It also becomes clear that the Battersea furnaces were being used to destroy other sensitive documents as well as used bank notes.
When the team discovers a classified document relating to a massacre of civilians carried out by the British Army in Kenya, they uncover a blackmail plot spanning more than 50 years.

Episode Viewers and Ratings

Season 4 Episode 5 of New Tricks resulted in a 0.00 rating in the 18-49 demographic.

New Tricks Season 4 Episodes...

• s04e01 - Casualty
• s04e02 - God's Waiting Room
• s04e03 - Ducking & Diving
• s04e04 - Nine Lives
• s04e05 - Powerhouse
• s04e06 - Buried Treasure
• s04e07 - Father's Pride
• s04e08 - Big Topped

New Tricks Show Summary

New Tricks follows the work of the Metropolitan Police Service's Unsolved Crime and Open Case Squad (UCOS). Led by Detective Superintendent Sandra Pullman, it is made up of retired police officers who have been recruited to reinvestigate unsolved crimes.

The series title is taken from the popular expression "You can't teach an old dog new tricks". The "old dogs" are successful in adapting their skills and experience to modern policing, with their knowledge of past cases proving especially useful.