Five teenage friends leave Brighton to wage jihad in Syria. All except one are killed. This is their untold story.

No Return is a unique insight into a hidden Britain, based on true events that so shocked intelligence experts they are now the Home Office's lead case study into youth radicalisation.

Drawing on a cache of leaked classified documents and unprecedented access to all the main players, award-winning investigative journalist Mark Townsend reveals the shocking truth behind what drew these young Britons to martyrdom in a foreign land. The end result is a fast-paced and powerfully gripping true crime account of radicalisation - and how it can be prevented.