As MacMillan and the team grill Shay, Lindo continues toinvestigate Clellan's death, leading to a shocking discoverywith potentially fatal consequences.
Watched by the world, the Metropolitan Police follow theradioactive trail of polonium across London, leading them totheir main suspects, Lugovoy and Kovtun.
The Gamache's anniversary celebrations at the exclusive ManoirBelleforet hotel are cut short by the discovery of a body.Gamache pulls in his team and together they investigate thecase, which focuses on the hotel's owners - the dysfunctionalMorrow family - who are driven by bitterness and jealousy.Meanwhile, Lacoste receives a surprise call which blows theBlue Two-Rivers case wide open.
Gamache and his team get to the heart of the case, excavatingdecades-old resentments and deeply buried secrets in the Morrowfamily as they do so, and make the key discovery that enablesthem to identify the killer. Meanwhile, Lacoste's elation atmaking a breakthrough in the Two-Rivers case proves short-livedand a tragedy leaves her shell-shocked.
A team of detectives led by Timmons' 'best man' Brian Tarpeyarrive in Moscow hoping to interview Lugovoy and Kovtun, nowthe prime suspects behind Litvinenko's murder.
With their investigation complete, Timmons's team submit theirfile to the Crown Prosecution Service, which charges Lugovoyand Kovtun with Litvinenko's murder.
The President and First Lady of Country Music are on top of theworld: hit after hit, award after award, and a new baby toboot. However, when a once-in-a-lifetime opportunity presentsitself in Las Vegas, Tammy is forced to question whetherGeorge can handle the pressures of superstardom.
As the search for Isla gets under way, Lindo continues toinvestigate Clellan's murder. A surprise visitor to the stationstuns the team, leading to a high-profile arrest.
Gamache returns to Three Pines to investigate the disappearanceof the popular resident Marc Fortier but it soon becomes amurder case that leads Gamache and his team into the heart ofthe village's dark past at St Anthony's. Meanwhile, Lacostediscovers a key piece of evidence relating to Blue'sdisappearance has been faked, and with Gamache's encouragementsecretly reopens the case.
The villagers confront the truth of their past and exorcisetheir collective demons as Gamache makes a breakthrough in themurder case and realises Marc's killer had a very personalmotive. Meanwhile, Lacoste makes a discovery relating toBlue's disappearance that seems to identify a key suspect.