Twelve strangers come together on the banks of a lake in the beautiful British countryside, with one thing in common – they want to win a lifechanging sum of money. They know nothing about the epic challenge that awaits them or what they'll need to do to win the cash. £100,000 lies on an island in the middle of a lake, and the twelve must build an 850ft bridge by hand within 20 days in order to reach the prize. A series of twists and turns along the way offer moral dilemmas, spark rivalries and put their ability to work together as a team to the test.