The net tightens as police arrest George and Layton and search their homes. But when the missing treasure is nowhere to be found, investigators start to wonder: is the hoard even real?

Meanwhile deleted photos offer a new lead.

Narrator: Aimee-Ffion Edwards

Contributors: Tim Hoverd, Nigel Cleeton, Peter Reavill, Simon Wicks, Gareth Thomas, Dr Gareth Williams, Kevin Hegarty KC

Sound Design: Peregrine Andrews

Production Co-ordinator: Dan Marchini

Associate Producer: David James Smith

Producer: Aron Keller

Exec Producer: James Robinson

A BBC Studios Audio Production

History is written by the winners – but in the ground beneath our feet, lie secrets someone has tried to bury. We travel back in time to 878AD, a world of warring Anglo Saxon kingdoms and Viking invasions. Historian Gareth Williams reveals how the coins found by George and Layton could rewrite the story of King Alfred’s reign and of Britain itself.

Narrator: Aimee-Ffion Edwards

Contributors: Dr Gareth Williams, Nigel Cleeton, Peter Reavill Sound Design: Peregrine Andrews Production Co-ordinator: Dan Marchini Additional Research: Holly Morgan

Associate Producer: David James Smith

Producer: Aron Keller

Exec Producer: James Robinson

A BBC Studios Audio Production

Trying to throw authorities off their scent, George and Layton hand in precious pieces of gold jewelry to a museum in Cardiff, spinning a story about how and where they were found. But archaeologist Peter Reavill isn't convinced - and as the true scale and value of the hoard become impossible to ignore, so do George and Layton's lies.

Narrator: Aimee-Ffion Edwards

Contributors: Peter Reavill, Simon Wicks, Dr Gareth Williams

Sound Design: Peregrine Andrews

Production Co-ordinator: Dan Marchini

Associate Producer: David James Smith

Producer: Aron Keller

Exec Producer: James Robinson

A BBC Studios Audio Production