Let the Right One in director Tomas Alfredson has nabbed quite an impressive cast for his upcoming drama Tinker, Tailor, Soldier, Spy. According to Variety, Ralph Fiennes, Colin Firth, Gary Oldman, and Michael Fassbender have all come aboard the project.

An espionage thriller, Tinker, Tailor, Soldier, Spy is based on the 1974 best seller penned by John le Carré. The story takes place during the aftermath of the Cold War and revolves around a spy hunter working within the highest echelons of the British Secret Intelligence Service. Peter Morgan wrote the adapted screenplay.

It is also noted that Tinker, Tailor, Soldier, Spy served as the basis for a popular 1970s' BBC series starring Alec Guinness, who is best known to some as the original Obi Wan Kenobi.