The Lincoln County War is on the verge of kicking off in a big way. Billy has joined Englishman John Tunstall in his commercial battle with Major Murphy and the…

The war has started, but John Tunstall is hospitalized by a smallpox outbreak.

Billy and the Regulators hear news that John Tunstall’s ranch is going to be raided.

The Regulators have been on the defensive since the start of war, but Billy draws up a plan which could bring the war to an end.

Elle keeps big news from Tao, Ben pressures Charlie to forgive him, and Isaac opens up to James. Nick invites Charlie to a tense family dinner.

The gang comes together for a memorable prom with a fitting theme: “Summer of Love.” But with someone important missing… it feels incomplete.

With Charlie’s grades slipping, his parents tighten the rules. Tao’s jealous when Elle makes new friends. Nick’s older brother invades his privacy.

Nick tries to come out to some of his teammates at a bonfire party after exams. Tao plans the perfect date. Things get weird between Tara and Darcy.

On a school trip to Paris, Nick and Charlie try to keep their relationship under wraps. Elle and Tao reconnect at a museum. Imogen stands up to Ben.

Rumors spread when Charlie wakes up with something on his neck. A group tour of the city’s most famous sights reveals more than one major secret.

On their last day in Paris, Nick introduces Charlie to his dad. Elle and Tao make it official. The truth comes out at a party that’s full of surprises.

As his relationship with Charlie matures, Nick considers coming out to Imogen — but it’s a lot harder than he expected. Elle tries flirting with Tao.

Toni’s rattled after Craig’s shock proposal. Rana is mistaken for a stripper.

Rana is determined to show a miserable policeman that Hull’s not dull.

Rana asks Toni and Paula for help when her mum is suspected of being in a drugs gang.

Toni’s nemesis Leanne hosts a lavish gender reveal party. Rana pursues Hull’s hottest man.

An important day has arrived for heavily pregnant Toni and Craig, but Craig’s nervous.

Toni reckons Craig’s mum’s new boyfriend is a true crime villain.

Taverner and Tearney face off for control of MI5. River and Louisa find themselves caught in the crossfire.

The Slow Horses fight for their lives. Lamb shares some devastating truths with Catherine.

A romantic relationship in Istanbul ends badly. Lamb hits the panic button when one of his Slow Horses fails to show up for work.

River has to steal something out of the Park to save a life. Lamb realizes a stranger game is afoot.