On Monday, Four Corners investigates the corporate crisis that engulfed the ABC and brought down both the Managing Director and the Chair in the space of one brutal week. Reporter Sarah Ferguson, in interviews with the two key individuals at the centre of this tumultuous episode, investigates the tensions and allegations that have rocked the national broadcaster - from the appointment of a "change agent" to reinvent the corporation, to the assertion of political interference at the highest levels. Former MD, Michelle Guthrie speaks for the first time about her sacking and the breakdown of her relationship with the ABC Board. Former Chair Justin Milne gives a frank account of the power struggle behind the scenes.