People have called Dr Ittai Gradel a kind of Sherlock Holmes, if Holmes were Danish and obsessed with gems. He’s an antiquities dealer with an eye for stolen goods who will help unlock the mystery at the heart of this story.

When Katie meets him in London, he’s got something to show her - two ancient gemstones he believes belong to the British Museum.

But this whodunnit begins more than a decade ago as a man with a cardboard box wanders into an antiques market. He has some valuable treasure to sell.

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

Archive: Sky News Australia