India, May 9 -- The world of undercover crime dramas has often explored dangerous double lives, but Legends draws from something far more unusual: a largely forgotten British Customs operation that quietly infiltrated drug networks during the 1990s heroin crisis. But how much of the story that inspired the Netflix show Legends is true? Know all the details here.

Created by Neil Forsyth, the six-part thriller stars Tom Burke as Guy Stanton, Steve Coogan as Don, Hayley Squires as Kate, Aml Ameen as Bailey, and Jasmine Blackborow as Erin, and explores the psychological cost of undercover work during Britain's escalating "War on Drugs".

Is the Netflix series Legends based on a true story? Yes. Legends is inspired by a real undercover custom...