The horrific murder of Emmett Till in Mississippi – and the travesty of a trial that followed it – helped spark the civil rights movement in the US. Now a major new film is bringing the true story of the tragic teenager and his activist mother to cinema audiences

It seems incredible that it was only in 2017 that Emmett’s murder was in the news when the woman whose evidence caused the lynching finally confessed that she had lied about him groping her.

Carolyn Bryant Donham, then 89, revealed how she made up the story that the black teenager molested her in her shop, as a result of which her husband and his half-brother murdered the youngster and were then both acquitted by an all-white jury…