The British High Command finds itself in the thick of a huge dilemma when it is realized that they have long been infiltrated by spies from a German intelligence group. This all happens during the preliminary stages of the Battle of Britain.

Frederick Stafford
as Captain Paul Stevens

Van Johnson
as Air Marshal George Taylor

Francisco Rabal
as Martin

Ida Galli
as Meg

Luigi Pistilli
as Maj. Kreuger

Renzo Palmer
as Sgt. Donald Mulligan

Luis DΓ‘vila
as Jacques

Christian Hay
as Gaston

Jacques Berthier
as Colonel Smith

Teresa Gimpera
as Sheila