<Li> Steve Munroe as warehouseman </Li> <Li> Nick Turner as Claire's friend </Li> <P> On 1 May 2011, Ridley Scott bought the film rights of the novel Before I Go to Sleep written by S.J. Watson and hired Rowan Joffé to direct and write the script . In February 2012 Nicole Kidman was in talks to join the film; later in May she joined to star as Christine . On 31 October 2012 Mark Strong also joined the cast of the film . According to The Hollywood Reporter on 16 November 2012, Kidman said she wanted Colin Firth to work with her again . They had already worked together in a drama The Railway Man . On 6 February 2013, it was confirmed that Firth has joined the cast to lead with Kidman . </P> <P> The film was shot in London and at Twickenham Studios . </P>

What is the twist in before i go to sleep