James Compton, a young journalist and crime writer, becomes intrigued by and then involved in the mysterious death of an older woman British tourist apparently on holiday near the ruins of Pompeii. On his return to England he becomes further implicated in what he now knows was a murder but his efforts to help the police are sabotaged by unknown forces who discredit him to such an extent that his evidence and his theories are devalued. However, so determined is he to bring the criminals to justice that he endangers not only his own life but that of his fiancee Juliet on the very day of their long awaited wedding.