When British Intelligence Officer Tracy Barnes attacks visiting German politician Dieter Krause, solicitor's clerk Joshua Mantle is called to help unravel the events which led to the assault.

This season sees dramatic changes in La Brigade Criminelle. We introduce Maigret's boss and mentor, Director of Police Xavier Guichard. Guichard has become suspicious of Maigret's growing fame and decides to 'take him down a peg.' One of Maigret's colleagues leaves, another is transferred by Guichard and replaced by a former Internal Affairs officer, George Bonfils who immediately makes himself unpopular with Maigret's core team. This internal turmoil is the backdrop for daring new adaptations of three of Georges Simenon’s best-known Maigret novels: The Hanged Man of Saint-Pholien, Maigret’s Revolver, and The Yellow Dog. As Maigret investigates cruel and heart-breaking crimes, he will find that the line between guilt and innocence can be impossibly blurred. He will have to reach deep into his heart to work out his own unique form of justice, for victims and perpetrators alike.

Amy Katz is murdered whilst taking part in a clinical trial for anti-depressant drugs, overseen by Dr. Alex Gansa, her psychiatrist following her soldier brother's death in Afghanistan. Amy captivated the other young male volunteers, including love-lorn Adam Douglas and Jack Collins - to the intense hatred of Jack's girlfriend Karen - but Amy was in love with the married Gansa. Several suspicious incidents cause Lewis to investigate the doctor.

England, Summer 1814 The war is over, Napoleon is in exile on Elba, and Sharpe returns to England. He accepts a posting to Scarsdale, Yorkshire, the town where he grew up, to head the private militia raised by Sir Willoughby Parfitt, a self-made man. He is to protect Parfitt's mills from a 'rebellious' population. At the centre of the trouble is a man called Matt Truman, who Sharpe grew up with. In London, Jane is finding life as a mistress difficult. She is shunned by society, including Lady Anne Carmoynes (once a mistress herself). In Yorkshire, Sharpe and Harper are met by the local yeomanry and their commander, Capt. Wickham. On their way to Parfitt's home, Sharpe and Harper realise they are being followed. Sharpe shoots one pursuer and corners the other whom he recognises as Matt Truman. Parfitt blames Truman for the local unrest. At dinner, that evening, another mill owner, Sir Percy Stanwyck, is present. Stanwyck is soon to take delivery of a steam engine, something that will give Parfitt competition. Stanwyck has heard of Sharpe from his son, who died shortly after Talavera. Also in Scarsdale is Dan Hagman, out of the army and looking for work. He joins Truman. Rossendale and Jane are also there to view a property that Rossendale has inherited. Part of Sharpe's job is to break up illegal meetings. When they are informed of one, Sharpe tells Wickham to arrest Truman without loss of life. Wickham disobeys, Truman escapes, but there is a massacre. Sharpe and Harper are appalled, even Hagman turns away from them. Later Sharpe believes there is a plot to put Stanwyck out of business and he and Harper thwart it. After an unpleasant meeting with Jane, Harper returns to Ireland but where can Sharpe find justice?

When lonely feminist lecturer Miranda Thornton is found dead after a video she submitted to a dating agency is viciously made public on a scurrilous website,the first conclusion is suicide. But,with her answer phone removed and finger prints wiped,foul play is suspected. Miranda opposed property developer David Connelly buying land belonging to her college and had been visited,via the website by unhappily married journalist Francis Mitchell, though he states that Miranda was dead when he visited her. Embittered ex-student Sebastian Dromgoole admits to posting the video but Hathaway is guilt-ridden after Dromgoole's girlfriend,whom he had asked to find out more information,is killed. Having found themselves on the website Lewis and Hathaway find that,contrary to claims,their principal suspects have known each other for two decades.

Hornblower captures the French vessel, Le Reve, and is asked by Pellew to sail her back to England so that she can be outfitted for the English navy, and also, as a favor, to convey the unusual Duchess of Wharfedale back home. Unfortunately, Le Reve, Hornblower, the duchess and the crew are captured by the Spanish and imprisoned. There, Horatio finds Kennedy, wasted and hopeless from months in solitary. Against the odds, Horatio must find a way to escape with Kennedy, against Hunter's protests, and with the growing suspicion that the duchess may not be who she appears.