BBC One has commissioned a new psychological competition series called The Traitors with Claudia Winkleman as host.
In the show, which is based on a Dutch format, contestants must work together to win a prize fund of up to £120,000 - unaware that among them, there are a number of saboteurs deliberately trying to thwart their tasks.
Each week the group must eliminate someone they believe to be a traitor - because in the final, if any traitors are left in the group, they will pocket the money instead.
"I'm obsessed by psychological games and I couldn't stop watching the Dutch version of the show," said Winkleman, also host of Strictly Come Dancing.
"The fact that the BBC version is set in a castle in Scotland and the producers want me to wear tweed meant I was all in."
Filming on the 12-episode series is already underway for an expected broadcast later this year.