A chatty motorist becomes agitated when officers start asking questions. Police are shocked when a fleeing driver calls his wife in the middle of a pursuit. Deputies catch a man lying and give him a test to prove his innocence.

In the midst of Billy's trial prep, Isaiah and Sadie visit her mother, Carolyn, in prison after they learn important information regarding her former accomplice. Also, Cameron and Albert defend a transwoman arrested for stabbing a famous baseball player, and Cameron finally gives into her feelings for Peter.

The plot to abduct Benedict Arnold is initiated, as the New York operation takes a turn; Peggy finally becomes aware of Cicero's hidden secret; George Washington and the French clash over the use of the correct strategy.

When Benvolio finds himself in serious trouble, he surprisingly turns to Rosaline for help. Meanwhile, Princess Isabella travels to Venice to try and make peace with the Doge, but quickly discovers he has other intentions.

Cosima is forced into an alliance with Susan Duncan when an old enemy returns to the island, accelerating P.T. Westmorland's sinister agenda. Meanwhile, Krystal stumbles onto a vital clue to the Neolution endgame.

Lisa's new career gets off to a dubious start. Meanwhile, Marianne prepares for a play and Ethan proves himself a less-than-stellar petsitter.

It's finals week. The top six contestants enter the kitchen to face a mystery box challenge to prove to the judges just how far they have come in the competition.

The Poldarks learn that their friend Dr Enys needs immediate care, suffering distress following his internment in France. In reaction to Ross' rescue of Hugh Armitage, George desperately needs to secure a connection to the nobility and so plans to force Morwenna's marriage to Osborne. Geoffrey Charles gives Drake his bible as a gift and naively reveals that Morwenna is to be wed. Drake confronts Morwenna and she agrees to marry him instead. Morwenna returns to Trenwith to tell George and Elizabeth that she will refuse Ossie's offer of marriage. Out of spite, George has Drake arrested for the theft of Geoffrey Charles' valuable bible, a crime for which Drake will hang.

A body is pulled from the Loch, and a photograph in his wallet provides a vital clue. Annie tries to gather further evidence by talking to a desperate Mhari, who refuses to believe the terrifying possibility she is presented with. Albrighton is threatened with arrest by Quigley, but nevertheless continues to pursue his own theory about the killings - even if it means putting his life on the line.