Agatha Raisin and the Haunted House — M.C. Beaton

THINGS THAT GO BUMP IN THE NIGHT...

Agatha Raisin, snug and warm in her Carsely cottage, has that same old feeling--boredom--until a report of a haunted house sends her and handsome new neighbor Paul Chatterton to investigate. Suddenly, middle-aged Agatha is aglow with romance and excitement.

But the glow fades fast. It turns out Paul is a cad. The victim of the haunting is a universally disliked old biddy. And the ghost is most likely someone playing a dirty trick. Then an old lady is soon found murdered. But never fear! For Agatha, solving a homicide is more fun than hunting a ghost. She quickly has a theory and a risky scheme. And she is about to make a startling discovery which can be her greatest triumph...or leave her heartbroken, in trouble with the police, and in danger of losing her reputation--or her life.