ReadingTheDots@social.vivaldi.net"The Devil You Know" by Josephine Cox. My rating: 3 out of 5 stars. Published in 2010.
Book description: One overheard conversation. One fateful evening. A lifetime of consequences. Sonny Fareham's lover - and also her boss - is the charismatic Tony Bridgeman, a successful and ruthless man who usually gets what he wants. But for Sonny, the affair that has promised a future of hope and happiness must end in desperate fear.