Four young Brits are on a path of radicalisation, leading to London's deadliest terror attacks. Chaos ensues as explosions rip through the city.

Investigators follow the trail back to a quiet Leeds suburb, where they make a shocking discovery; the father of one of the bombers speaks out.

As London settles, a second string of attempted attacks sparks a manhunt; the true architect of 7/7 reveals how he planned the attacks.