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Charles Hayward arrives in Egypt, where he meets Sofia, the granddaughter of millionaire Aristide Leonidas. Two years later, Charles comes to Sofia with the intention of asking for her hand in marriage. However, Sofia's family suffers a tragedy - her grandfather is killed. Over time, the circumstances of his death become clear: instead of insulin, he was injected with a lethal dose of eye medication. Any of the family members could have switched the bottles. Charles, being the son of a police commissioner, takes up the investigation...