Detective Inspector Brent Hyatt and Detective Sergeant Chris Hoar, are summoned to University College Hospital in Central London to interview a patient with an extraordinary story to tell.
The day after Litvinenko's death, radiation teams swarm across London to secure potentially contaminated sites visited by the Russian spy.
A team of detectives led by Timmons' 'best man' Brian Tarpey arrive in Moscow hoping to interview Lugovoy and Kovtun, now the prime suspects behind Litvinenko's murder.
With their investigation complete, Timmons' team submit their file to the Crown Prosecution Service, who charge Lugovoy and Kovtun with Litvinenko's murder.
David Tennant
Alexander Litvinenko
Margarita Levieva
Marina Litvinenko
Mark Bonnar
DS Clive Timmons
Neil Maskell
Brent Hyatt
Barry Sloane
DS Jim Dawson
