An experimental prison in a National Park is under threat of closure as the inexperienced manager has been releasing prisoners for “good behaviour,” and there are now too few inmates left for the place to be viable. Some of the prisoners are desperate to keep the prison open as they have hit upon various money making schemes which take full advantage of the natural surroundings. Meanwhile a ministry official visits, intent on closing the prison, forcing staff and prisoners to co-operate in an all out effort to keep the facility open.