|Julie Andrews||Lili Smith (Schmidt)|
|Rock Hudson||Maj. William Larrabee|
|Jeremy Kemp||Col. Kurt Von Ruger|
|Lance Percival||T.C. Carstairs|
|Jacques Marin||Maj. Duvalle|
|Michael Witney||Lt. George ``Youngblood'' Carson|
In World War I London, half-British, half-German Lili Smith lets her German ''uncle'' -- a foreign agent and German military liaison -- talk her into spying. A dance-hall singer who is popular with the British troops, Lili uses her charm and racy numbers to secure the interest of flying squadron leader Maj. William Larrabee . Before Lili can pass on vital information, however, she finds herself in love with Larrabee -- who unfortunately discovers her real identity.