This paper details Von Lüttichau's relationship with Carl Jung and Bill Wilson, co-founder of Alcoholics Anonymous (AA), and her role as intermediary in the relationship between the two men. Her contribution within this mediator role has not been previously recognized but is an important factor in explaining how Jung became introduced to the AA 12-step format and validated the effectiveness of group work. After the Second World War, Von Lüttichau travelled between America and Switzerland and introduced the writings and ideas of Wilson and Jung to each other and acted as an intermediary between both titans. Jung gave Von Lüttichau extraordinarily detailed instructions on how the 12-step programme of AA could be applied to ‘general neurotics’. Von Lüttichau's private papers provide a bridge between Jung and Wilson's correspondence and help to piece together gaps in both Jungian and AA history.