The British and Spanish project stars Clive Owen, Kerry Fox, Carice van Houten and Daniel Brühl in the leads. The shooting began in the end of June [year missing] in London, Madrid and Segovia under the directorial guidance Juan Carlos Fresnadillo. The screenplay was written by the Spanish duo Nicolás Casariego and Jaime Marques, based on a story by Juan Carlos Fresnadillo.Belén Atienza and Enrique López Lavigne works as producer for Antena 3 Films, Apaches Entertainment and Universal Pictures.