A prim missionary is forced to flee her home in German East Africa at the outbreak of the First World War. The only transport available comes courtesy of a gin-sodden riverboat captain, and as the bickering and unlikely travelling companions make their perilous journey, she persuades him to aid the British war effort. John Huston's romantic adventure, starring an Oscar-winning Humphrey Bogart, Katharine Hepburn and Robert Morley