| Director | Ralph Thomas |
|---|---|
| Box office | £144,000 |
In 1940, after the fall of France, the fictitious Channel Island of Armorel is occupied by a small garrison of German troops under the benign command of Hauptmann Weiss. The hereditary ruler, the Suzerain, is away in the British Army, leaving the Provost in charge.
Back in London, the Ministry of Agriculture realise that during the evacuation of the island, Venus, a prize pedigree pregnant cow, was left behind. They petition the War Office to do something urgently due to the value of the cow's bloodline, and Major Morland is assigned the task of rescuing Venus. The Suzerain's sister, Nicola Fallaize, is in Wales, serving as an Auxiliary Territorial Service army cook. She is quickly posted to the War Office so she can tell them about the island. However, when Morland finds out that Venus is practically a member of her family, he obtains permission to ask her to go along. They, radio operator Sergeant Forbes and naval officer "Trawler" Langley, who knows the local waters, are taken to the island by submarine.
They contact the Provost and discover that Weiss, a cattle breeder in civilian life, is about to have the cow shipped to Germany. Nicola persuades her pacifist cousin and painter Lionel Fallaize to disguise another cow as Venus, so they can switch them. Weiss detects the deception, and the chase is on. They are captured by Sergeant Vogel, but manage to overpower him (after Venus gives birth). They spirit the cow and her calf onto a Royal Navy Motor Torpedo Boat which takes them to Britain, sinking a pursuing German E-boat in the process.