Teenager Cameron Finnigan from Horsham in Sussex is arrested in a dawn raid. Behind it all is a shadowy online network called 764, so dangerous it’s being hunted by the FBI and global law enforcement.

The BBC investigates how Finnigan became entangled in a world where teenagers are coerced into live streaming rituals, self-harm and murder plots.

Presenter Jo looks deeper into the predators behind 764 and explores how they are reaching vulnerable children in their bedrooms.

Written and Produced by Jo Palmer.

For information and support on issues discussed in this series, visit bbc.co.uk/actionline.