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At the outbreak of the First World War, with the death of her brother and the destruction of their Methodist mission, spinster Rose Sayer is persuaded to escape a burnt-out village by Canadian mechanic Charlie Allnut, proud owner of small steam launch the African Queen.

Together, they navigate their way down the Ulanga River, but while Charlie is content to sit the war out, Rosie is set on revenge and comes up with an unlikely plan.