The Dark Crusader by Alistair MacLean

THE DARK CRUSADER...

Eight advertisements. Eight jobs. Eight specialists in modern technology required. Applicants to be married, with no children, prepared to travel. Highly persuasive salaries.

Eight positions filled. Eight scientists - and their wives - disappear. Completely.

The ninth advertisement, Sydney, Australia. Fuel specialist required. But this time the scientist is prepared for trouble...