State of Play is a British television drama series, written by Paul Abbott and directed by David Yates, that was first broadcast on BBC One in 2003. The series tells the story of a newspaper's investigation into the death of a political researcher, and centres on the relationship between the leading journalist, Cal McCaffrey, and his old friend, Stephen Collins, who is a Member of Parliament and the murdered woman's employer. The series is primarily set in London and was produced in-house by the BBC in association with the independent production company Endor Productions. The series stars David Morrissey, John Simm, Kelly Macdonald, Polly Walker, Bill Nighy, and James McAvoy in the main roles. The series was Abbott's first attempt to write a political thriller, and he initially made the majority of the plot up as he went along. He was prompted to write the series after BBC Head of Drama Jane Tranter asked him whether he would consider writing a piece "bigger" than anything he had written so far in his career. The serial was Abbott's third major writing project for the channel, following Clocking Off and Linda Green. The series was also a major turning point in David Yates' directorial career, as he began to direct various high-profile television projects following his work on the series.