This layered political drama is grounded by a career best character turn from David Tennant, who imbues Alexander 'Sasha' Litvinenko with no small amount of dignity.
The Doctor Who star has transformed into the ex-Russian spy for a new mini-series.
The actor plays poisoned Russian defector Alexander Litvinenko in a new true crime series.
The Russian spy was killed in London in 2006.
The drama will follow the Scotland Yard officers who tried to prove who was behind Litvinenko's death.