When a wealthy Englishman, Paul Ashfield travels to Australia in search of the birth mother he thinks deserted him, he never expects to meet and fall in love with Daphne Clarke. Upon meeting her parents, Paul is horrified by the possibility that they have the same mother. He beats a hasty retreat, believing he has slept with his sister.
Amidst the turmoil of WW2 they meet again in singapore, where he discovers the truth, Daphne is not his sister. They marry as the Japanese pour into Malaya and Singapore teeters on the birnk of invasion. In the chaotic aftermath, each believe the other has died during the bombing. When they finally see each other again, it is in a church, where Paul is about to enter into an arranged marriage.