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The Adventurers is set in South Africa at the end of the Boer war. Commando Pieter Brandt (Jack Hawkins) comes across the dead body of a diamond courier. Brandt buries both the courier and his valuable cache of diamonds then heads back to his regiment. After the cessation of hostilities, Brandt raises money for an expedition back into the mountainous regions where the diamonds are hidden. There's no love lost among Brandt and his three treasure-hunting companions; particularly prickly is the relationship between Brandt and Clive Hunter (Dennis Price), whose wife is Brandt's former fiancé. Sort of an African variation of Treasure of the Sierra Madre, The Adventurers is buoyed by an unusually vicious performance by Jack Hawkins.