The Sheikh's Blackmailed Mistress. Penny Jordan

Life has taught Prince Vereham al a'Karim bin Hakar to control his emotions. Duty to his kingdom drives the enigmatic sheikh. But one unexpected, intensely sexy encounter with inexperienced Samantha McLellan shakes Vere's steely control. And when he discovers that Sam could be betraying his country, he decides to blackmail her–into being his mistress!