A barrage of sleuth spoofing fills this cheery comedy about a zany quartet of trainee spies. Working for STENCH (The Society for the Total Extinction of Non-Conforming Humans) the four attempt to get back Formula "X" from the villainous Dr. Crow. On their travels from Vienna to Algiers

via the Orient Express, the group encounters nonstop nonsense, making this film one of the bright spots in the "Carry On" series.