Death of a Prankster - M. C. Beaton

But this time the body that falls out of the closet is Andrew Trent's own. And nobody's laughing.
Especially not Constable Hamish Macbeth, who is hard put to glean any information from Trent's unappealing nearest and dearest. And when the lanky constable's former flame, Priscilla Halburton-Smythe, inserts her beautiful self into the case, Hamish must muster all his native guile to carry him through. Fortunately, he has a few clever tricks up his own sleeve, which enable this most endearing of crime fighters to get the best, and last, laugh.