I liked this film and thought it was very well done although apparently more "trudging" and slow moving than some people would prefer. I thought it was a good portrayal of the dilemma Joan has in choosing between the wishes and demands of her "true love" to give him classified information about the British nuclear program to transmit to the Soviets and her desire not to betray her country. Although, in historical perspective, she made what most people would consider to be the wrong decision, at the time she convinced herself her sharing nuclear secrets was in the long term best interests of world peace. Sophie Cookson's portrayal of the young Joan was excellent as was Judy Dench's performance of the elderly Joan who was finally "caught." Although many people describe the movie as too slow moving and dreary or monotonous, I enjoyed a movie that doesn't have constant action, violence, vehicle chases, and CGI critters like all the superhero movies that are so prevalent these days.