The film was followed by her appearance in Morten Tyldum's historical drama "The Imitation Game", a film based on the life of British mathematician Alan Turing, played by Benedict Cumberbatch. Knightley portrayed cryptanalyst and numismatist Joan Clarke, who decrypted German intelligence codes for the British government during World War II with Turing. Knightley researched interviews with Clarke, and sought to keep her "upper-class quality", drawing on the depth of her emotions and protectiveness of Turning from the script. "The Imitation Game" became a critical and commercial success grossing over $233.6 million. For her performance, Knightley received her second Academy Award and BAFTA Award nominations, and third Golden Globe Award nomination, all for Best Actress in a Supporting Role. Conversly, Lady Jean Forde, who worked with Clarke and Turing, felt Knightley was "nothing like" Clarke and was "too beautiful" to play her. Knightley's sole release in 2015 was as part of the ensemble cast in the biographical disaster film "Everest". The film was based on the 1996 Mount Everest disaster with Knightley portraying mountaineer Rob Hall's wife. "Everest" opened to mixed review from critics. "Variety" wrote that Knightley gave a "deeply felt performance" as a woman "haunted by the possibility" of losing her spouse.