Shallow grave - Cynthia Harrod-Eagles

D.I. Bill Slider is keen on architecture - what Atherton calls his edifice complex - and the Old Rectory is his kind of house. But in a hole on the terrace is the dead body of Jennifer Andrews.
It looks straightforward; Jennifer was a flirt, and the hole was dug by her jealous husband Eddie.
But why was Jennifer's body so unmarked? How did she reach her shallow grave unnoticed?
When Slider finally gets a confession, it's from a wholly incredible source.
To compound his troubles, he has a linguicidal new boss, more bills than a flock of pelicans, and a future ex-wife becoming less ex by the minute...