7. Treasure Hunt

Ittai Gradel says he sold on some of the gems he thinks came from the British Museum.

A mission to hunt them down leads the team through the backstreets of Paris and to a small town in Germany.

Presenter: Katie Razzall

Producers: Darin Graham, Ben Henderson and Larissa Kennelly

Production Coordinator: Gemma Ashman

Mix and sound design : James Beard

Composer: Jenny Plant

Exec-producer: Joe Kent

Investigations Editor: Ed Campbell

Series Editor: Matt Willis

Commissioning Executive: Tracy Williams

Commissioning Editor: Dan Clarke