Death of a Prankster(1992)

M.C. Beaton

"A case that Hamish Macbeth fans will relish." Booklist.
A Hamish Macbeth Mystery by the author of "Death of a Snob."
When it comes to murder, Constable Hamish Macbeth can't see the joke. Rich, old practical joker Andrew Trent summons his kin to remote Arrat House in the dead of winter for a deathbed farewell. But when they arrive, the old coot is in perfect health, cackling at his joke and ready to torment them with others.
But it turns out the joke's on Trent. As the saying goes, he who laughs last, kills first! And when Trent is murdered, Constable Macbeth must step in and solve the crime before the punchline of the next killing joke knocks him right into an early grave!