A soldier suffering from PTSD seeks therapy to become normal, but the therapist doesn't know what normal is.

Mark is a returning soldier suffering from PTSD (post-traumatic stress disorder). With the help of a newly-qualified therapist, Tess, and her role-playing, we begin to understand Mark and the people in his life: his sister; a prostitute he is in love with; and the neighbour he is spying on.—British Film Council website.