Showing Double Bluff by Dell Shannon

Lieutenant Mendoza seems to be beset on all sides: at home, his wife Alison is convinced she is having twins; at the office his worry is a man called Francis Ingram, prime suspect for a murder Mendoza does not think he has committed.

Yet the fact remains that someone has murdered Mendoza's wife, Arabella, and the evidence points straight at him. But as the case progresses it becomes clear that everyone has a grudge against her and a consuming interest in her will . . .