Cajun nights

"Part mystery, part horror novel, this unusual thriller offers a rich gumbo made up of equal parts voodoo, Cajun history, and New Orleans ambiance. An utterly horrifying murder-suicide; in which, a seemingly ordinary man suddenly goes berserk, burning his family and himself to death. Other murder-suicides follow, linked only by the fact that all the killers were humming nursery rhymes just prior to the mayhem. New Orleans medical examiner Andy Broussard and police psychologist Kit Franklyn investigate, determined to find a rational explanation for the crimes, which seem more and more to be the result of a voodoo-inspired curse."
"Imagine investigating a case where each of the several victims had type O blood, drove an obsolete car, and hummed a nursery rhyme before committing murder and then suicide. That's young criminal psychologist Kit Franklyn's assignment and the solution just seems plain impossible. Her obese, jovial boss, chief medical examiner Andy Broussard, is just as baffled as she is. Together, they devise strictly scientific possibilities. Not once do they consider black magic to be the culprit until an ancient Cajun sorcerer's curse surfaces, "Beware the songs you loved in youth.""@en