A message from the makers of The Polybius Conspiracy...

BBC Radio 4 and BBC Sounds host The Incident at Ong's Hat, a new audio drama created from the creators of The Polybius Conspiracy and Passenger List.

Our final episode airs live next Friday (2/24) on Radio 4, but you can download the entire series now by going to the BBC Sounds' Limelight feed.

We appreciate your continued listenership. Thank you a million times, no matter what dimension you're connecting from.

Ong’s Hat is rumored to have once been the site of a gateway to another dimension. After meeting on a forum devoted to the urban legend, yoga instructor Sarah Larsen, and schoolteacher Charlie Brill, go on a road trip to the New Jersey Pine Barrens where a group of renegade Princeton professors had once conducted quantum physics and chaos theory experiments to discover a new theory for dimensional travel. When Sarah disappears, Charlie finds himself at the center of a mystery. Corey Brill (The Walking Dead) stars in this docu-thriller for Radio 4 and BBC Sounds from the makers of The Polybius Conspiracy and Passenger List.

Fact, fabrication, history and hoax converge as the search for Marc comes full circle.

Questions about Bobby result in a surprising lead, as Rubin comes to believe he's cracked the code on Polybius.

New clues about the whereabouts of Rubin's missing partner shed light on secrets Bobby might prefer stay hidden. The team looks into how one might go about vetting the authenticity of a Polybius cabinet.

Sometimes journalists pursue a mystery; other times, it pursues them. An unexpected phone call from Naomi Halbrook leads to more revelations, while a competing documentary project about Polybius leads to conflict.

The search for answers leads the team to a retired journalist with a bizarre connection to Coin Kingdom, and unsettling allegations of abuse at an international youth academy.

As a man comes forward to potentially corroborate Bobby's story, the path forward plunges into the darkness of another Oregonian legend: the infamous Shanghai Tunnels.