Infighting and external forces threaten to split the gang, throwing their final mission into jeopardy. Fallon colludes with the Black Power Desk, now being led by Cullen. Dhari and Marcus fight for the position of alpha male. Jas, determined, gathers materials for their ultimate action. Meanwhile, unbeknownst to Jas, Marcus receives news that threatens to destroy their relationship - and their final mission. Limited series finale.

Kent begins to enjoy his role and forms a surprising alliance. Cullen and Fallon bond over a shared history Meanwhile, as Eliette and Jas speculate about the future, Dhari and Marcus put their personal issues aside - and the infighting that threatened to destroy the gang falls away as they come together to embark on a brutal mission. In a desperate attempt to save his relationship with Jas, Marcus decides to do something they will never come back from.

London, 1971. In an age of open racism, fervent nationalism and anti-establishment passion, two politically engaged and idealistic young lovers, Marcus Hill and Jas Mitra, fight back against the injustice and deep-rooted prejudice they face on a daily basis. But, unbeknownst to them, they are being targeted by Special Branch's Black Power Desk, led by police officer DCI Nicholas Pence and his deputy, Cullen.

Marcus, Jas and Dhari are on the run, their faces plastered all over the news. Hot on their heels are Pence and Cullen, who harass Fallon and the black community, in a desperate attempt to locate the gang. Condemned by community activist Kent Fue, Marcus and Jas are forced to lay low in a safe house as Dhari and Leroy pursue a dangerous and controversial mission. Feeling marginalized, Jas brings London to a standstill when she does something unthinkable.