Keira Knightley and Carey Mulligan on Never Let Me Go

Never Let Me Go is an adaptation of the best-selling novel by Kazuo Ishiguro and tells the story of a group of friends whose lives hold a dark secret.

It stars three of Britain's biggest young acting talents, Carey Mulligan, Keira Knightley and Andrew Garfield.

The BBC's Entertainment Correspondent Lizo Mzimba reports.