Dickie Dreadnought is the boxing-mad nephew of pious clergyman Reverend Sydney Mullet. To mollify his disapproving uncle, Dickie embarks on an elaborate plan to keep his budding boxing career a secret, with he and his tough-talking promoter Wally Burton both pretending to be devout 'men of the cloth'.
Lilli Marlene, a French girl working as a bar maid in her uncle's café in Benghazi, Libya, turns out to be the girl that the popular German wartime song Lili Marleen had been written for before the war, so both the British and the Germans try to use her for propaganda purposes - especially as it turns out that she can sing as well. When the Germans kidnap her in Cairo and she starts appearing in radio broadcasts from Berlin, her British soldier friends think that she's joined the enemy. They couldn't be more wrong, because after the war it turns out that her songs over the radio contained secret messages to London from British agents in Berlin.
During a holiday to the beach Jenny meets Alan and agrees to spend the week with him. Wanting to keep this a secret from her parents Jenny gets help from her friend Mary to pretend her whereabouts but disaster strikes during a boating accident. It is soon discovered Jenny was not with Mary. When the parents find out the truth they pressure the couple to get married, but Jenny thinks otherwise.
The story leading up to the wedding of Lilli Marlene.
