Rachel McAdams, Taylor Kitsch and Kelly Reilly Join HBO's 'True Detective'

Rachel McAdams, Taylor Kitsch and Kelly Reilly.

Rachel McAdams, Taylor Kitsch and Kelly Reilly have been added to the cast of HBO's True Detective, joining Colin Farrell and Vince Vaughn. The eight-episode hour-long drama has begun production in California.

In True Detective, three police officers and a career criminal must navigate a web of conspiracy in the aftermath of a murder.

Colin Farrell stars as Ray Velcoro, a compromised detective whose allegiances are torn between his masters in a corrupt police department and the mobster who owns him.

Vince Vaughn will play Frank Semyon, a criminal and entrepreneur in danger of losing his empire when his move into legitimate enterprise is upended by the murder of a business partner.

Rachel McAdams is Ani Bezzerides, a Ventura County Sheriff's detective whose uncompromising ethics put her at odds with others and the system she serves.

Taylor Kitsch is playing Paul Woodrugh, a war veteran and motorcycle officer for the California Highway Patrol, running from a difficult past and the sudden glare of a scandal that never happened.

Kelly Reilly takes on the role of Jordan, Frank Semyon's wife, a former D-list actress who is a full partner in his enterprises and ambitions.

True Detective is created and written by Nic Pizzolatto. Justin Lin will direct the first two episodes.